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// SumBigDecimalHex.java
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import java.math.BigDecimal;
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import java.math.BigInteger;
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public class SumBigDecimalHex {
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public static void main(String[] args) {
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BigDecimal sum = new BigDecimal("0");
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for (String argument : args) {
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StringBuilder number = new StringBuilder();
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for (char c : argument.toCharArray()) {
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if (!Character.isWhitespace(c)) {
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number.append(c);
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} else {
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sum = sum.add(parseNumber(number));
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number = new StringBuilder();
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}
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}
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sum = sum.add(parseNumber(number));
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}
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System.out.println(sum);
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}
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static BigDecimal parseNumber(StringBuilder number) {
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if (!number.isEmpty()) {
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String numberString = number.toString().toLowerCase();
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if (numberString.startsWith("0x")) {
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numberString = numberString.substring(2);
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if (numberString.contains("s")) {
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int indexOfS = numberString.indexOf('s');
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String mantissaHexString = numberString.substring(0, indexOfS);
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String exponentHexString = numberString.substring(indexOfS + 1);
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BigInteger mantissa = new BigInteger(mantissaHexString, 16);
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BigInteger exponent = new BigInteger(exponentHexString, 16);
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return new BigDecimal(mantissa).scaleByPowerOfTen(exponent.negate().intValueExact());
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}
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return new BigDecimal(new BigInteger(numberString, 16));
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} else {
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return new BigDecimal(numberString);
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}
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} else {
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return BigDecimal.ZERO;
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}
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}
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}
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@@ -0,0 +1,971 @@
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<title>SumBigDecimalHex – CodeJava</title>
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<meta name="description" content="Task Input data fits into BigDecimal data type There are decimal and hexadecimal numbers in input Hexadecimal numbers has 0x prefix, so for example 0xbsc equals 11·10⁻¹² (mantissa and exponent are integers) Input is case insensitive Class should be named SumBigDecimalHex Solution This is the hardest (and last) modification for this homework.
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Let’s modify our SumDoubleHex parseNumber method. This is what it looks now
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static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith("0x") || numberString.startsWith("0X") ) { if (numberString.contains(".")) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Let’s make some small changes:" /><link rel="canonical" href="http://localhost:1313/courses/prog-intro/homeworks/sum/sumbigdecimalhex/" itemprop="url" />
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<meta itemprop="description" content="Task Input data fits into BigDecimal data type There are decimal and hexadecimal numbers in input Hexadecimal numbers has 0x prefix, so for example 0xbsc equals 11·10⁻¹² (mantissa and exponent are integers) Input is case insensitive Class should be named SumBigDecimalHex Solution This is the hardest (and last) modification for this homework.
|
||||
Let’s modify our SumDoubleHex parseNumber method. This is what it looks now
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static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith("0x") || numberString.startsWith("0X") ) { if (numberString.contains(".")) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Let’s make some small changes:">
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<meta name="twitter:description" content="Task Input data fits into BigDecimal data type There are decimal and hexadecimal numbers in input Hexadecimal numbers has 0x prefix, so for example 0xbsc equals 11·10⁻¹² (mantissa and exponent are integers) Input is case insensitive Class should be named SumBigDecimalHex Solution This is the hardest (and last) modification for this homework.
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||||
Let’s modify our SumDoubleHex parseNumber method. This is what it looks now
|
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static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith("0x") || numberString.startsWith("0X") ) { if (numberString.contains(".")) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Let’s make some small changes:">
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|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/"
|
||||
|
||||
>Sum
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hextra-sidebar-active-item hx:bg-primary-100 hx:font-semibold hx:text-primary-800 hx:contrast-more:border hx:contrast-more:border-primary-500 hx:dark:bg-primary-400/10 hx:dark:text-primary-600 hx:contrast-more:dark:border-primary-500"
|
||||
href="/courses/prog-intro/homeworks/sum/sumbigdecimalhex/"
|
||||
|
||||
>SumBigDecimalHex
|
||||
</a>
|
||||
|
||||
<ul class='hx:flex hx:flex-col hx:gap-1 hx:relative hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:dark:before:bg-neutral-800 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:pr-3 hx:rtl:before:right-0 hx:ltr:ml-3 hx:rtl:mr-3'><li>
|
||||
<a
|
||||
href="#solution"
|
||||
class="hx:flex hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [word-break:break-word] hx:cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] hx:contrast-more:border hx:gap-2 hx:before:opacity-25 hx:before:content-['#'] hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:text-gray-900 hx:contrast-more:dark:text-gray-50 hx:contrast-more:border-transparent hx:contrast-more:hover:border-gray-900 hx:contrast-more:dark:hover:border-gray-50"
|
||||
>Solution</a>
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumbigintegeroctal/"
|
||||
|
||||
>SumBigIntegerOctal
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumdouble/"
|
||||
|
||||
>SumDouble
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumdoublehex/"
|
||||
|
||||
>SumDoubleHex
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumhex/"
|
||||
|
||||
>SumHex
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumlongoctal/"
|
||||
|
||||
>SumLongOctal
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/conclusion/"
|
||||
|
||||
>Summing Up
|
||||
</a>
|
||||
|
||||
</li></ul>
|
||||
</div>
|
||||
</li></ul>
|
||||
</div>
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/lectures/"
|
||||
|
||||
>Lectures
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/lectures/intro/"
|
||||
|
||||
>Lecture 1. Introduction
|
||||
</a>
|
||||
|
||||
</li></ul>
|
||||
</div>
|
||||
</li></ul>
|
||||
</div>
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/paradigms/"
|
||||
|
||||
>Paradgims of Programming
|
||||
</a>
|
||||
|
||||
</li></ul>
|
||||
</div></li>
|
||||
</ul>
|
||||
|
||||
<ul class="hx:flex hx:flex-col hx:gap-1 hx:max-md:hidden">
|
||||
|
||||
<li class=""><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/spring-boot/"
|
||||
|
||||
>Spring Boot
|
||||
</a></li>
|
||||
<li class="open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/"
|
||||
|
||||
>Introduction to Programming in Java
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a><div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/"
|
||||
|
||||
>Homeworks
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/"
|
||||
|
||||
>Sum
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col open"><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hextra-sidebar-active-item hx:bg-primary-100 hx:font-semibold hx:text-primary-800 hx:contrast-more:border hx:contrast-more:border-primary-500 hx:dark:bg-primary-400/10 hx:dark:text-primary-600 hx:contrast-more:dark:border-primary-500"
|
||||
href="/courses/prog-intro/homeworks/sum/sumbigdecimalhex/"
|
||||
|
||||
>SumBigDecimalHex
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumbigintegeroctal/"
|
||||
|
||||
>SumBigIntegerOctal
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumdouble/"
|
||||
|
||||
>SumDouble
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumdoublehex/"
|
||||
|
||||
>SumDoubleHex
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumhex/"
|
||||
|
||||
>SumHex
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/sumlongoctal/"
|
||||
|
||||
>SumLongOctal
|
||||
</a>
|
||||
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/homeworks/sum/conclusion/"
|
||||
|
||||
>Summing Up
|
||||
</a>
|
||||
|
||||
</li></ul>
|
||||
</div>
|
||||
</li></ul>
|
||||
</div>
|
||||
</li><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/lectures/"
|
||||
|
||||
>Lectures
|
||||
<span class="hextra-sidebar-collapsible-button"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="hx:h-[18px] hx:min-w-[18px] hx:rounded-xs hx:p-0.5 hx:hover:bg-gray-800/5 hx:dark:hover:bg-gray-100/5"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" class="hx:origin-center hx:transition-transform hx:rtl:-rotate-180"></path></svg></span>
|
||||
</a>
|
||||
<div class="hx:ltr:pr-0 hx:overflow-hidden">
|
||||
<ul class='hx:relative hx:flex hx:flex-col hx:gap-1 hx:before:absolute hx:before:inset-y-1 hx:before:w-px hx:before:bg-gray-200 hx:before:content-[""] hx:ltr:ml-3 hx:ltr:pl-3 hx:ltr:before:left-0 hx:rtl:mr-3 hx:rtl:pr-3 hx:rtl:before:right-0 hx:dark:before:bg-neutral-800'><li class="hx:flex hx:flex-col "><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/prog-intro/lectures/intro/"
|
||||
|
||||
>Lecture 1. Introduction
|
||||
</a>
|
||||
|
||||
</li></ul>
|
||||
</div>
|
||||
</li></ul>
|
||||
</div></li>
|
||||
<li class=""><a
|
||||
class="hx:flex hx:items-center hx:justify-between hx:gap-2 hx:cursor-pointer hx:rounded-sm hx:px-2 hx:py-1.5 hx:text-sm hx:transition-colors [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] [word-break:break-word]
|
||||
hx:text-gray-500 hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:contrast-more:border hx:contrast-more:border-transparent hx:contrast-more:text-gray-900 hx:contrast-more:hover:border-gray-900 hx:dark:text-neutral-400 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:contrast-more:dark:text-gray-50 hx:contrast-more:dark:hover:border-gray-50"
|
||||
href="/courses/paradigms/"
|
||||
|
||||
>Paradgims of Programming
|
||||
</a></li>
|
||||
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
|
||||
<div class=" hx:sticky hx:bottom-0 hx:max-h-(--menu-height) hx:bg-white hx:dark:bg-dark hx:mx-4 hx:py-4 hx:shadow-[0_-12px_16px_#fff] hx:flex hx:items-center hx:gap-2 hx:border-gray-200 hx:dark:border-neutral-800 hx:dark:shadow-[0_-12px_16px_#111] hx:contrast-more:border-neutral-400 hx:contrast-more:shadow-none hx:contrast-more:dark:shadow-none hx:border-t" data-toggle-animation="show"><div class="hx:flex hx:grow hx:flex-col"><div class="hx:flex hx:justify-items-start hx:group" data-theme="light">
|
||||
<button
|
||||
title="Change theme"
|
||||
data-state="closed"
|
||||
data-location="bottom"
|
||||
class="hextra-theme-toggle hx:cursor-pointer hx:rounded-md hx:text-left hx:font-medium hx:h-7 hx:px-2 hx:text-xs hx:hover:bg-gray-100 hx:hover:text-gray-900 hx:dark:hover:bg-primary-100/5 hx:dark:hover:text-gray-50 hx:font-medium hx:text-gray-600 hx:transition-colors hx:dark:text-gray-400 hx:grow"
|
||||
type="button"
|
||||
aria-label="Change theme"
|
||||
>
|
||||
<div class="hx:flex hx:items-center hx:gap-2 hx:capitalize"><svg height=12 class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z"/></svg><span class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden">Light</span><svg height=12 class="hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z"/></svg><span class="hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden">Dark</span><svg height=12 class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor">
|
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<path d="M 11.996094,2 C 6.4986225,2.0192368 2.03125,6.5024993 2.03125,12 c 0,5.497501 4.4673725,9.980763 9.964844,10 H 12 12.0039 c 5.497471,-0.01924 9.964844,-4.502499 9.964844,-10 0,-5.4975007 -4.467373,-9.9807632 -9.964844,-10 H 12 Z M 12,4 c 4.417218,0.017598 7.96875,3.5822356 7.96875,8 0,4.417764 -3.551532,7.982402 -7.96875,8 z" />
|
||||
</svg>
|
||||
<span class="hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden">System</span></div>
|
||||
</button>
|
||||
<ul
|
||||
class="hextra-theme-toggle-options hx:hidden hx:z-20 hx:max-h-64 hx:overflow-auto hx:rounded-md hx:ring-1 hx:ring-black/5 hx:bg-white hx:py-1 hx:text-sm hx:shadow-lg hx:dark:ring-white/20 hx:dark:bg-neutral-800"
|
||||
style="position: fixed; inset: auto auto 0px 0px; margin: 0px; min-width: 100px;"
|
||||
data-theme="light"
|
||||
>
|
||||
<li class="hx:flex hx:flex-col">
|
||||
<p
|
||||
data-item="light"
|
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class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
|
||||
>
|
||||
Light
|
||||
<span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=dark]:hidden hx:group-data-[theme=system]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
|
||||
</p>
|
||||
</li>
|
||||
<li class="hx:flex hx:flex-col">
|
||||
<p
|
||||
data-item="dark"
|
||||
class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
|
||||
>
|
||||
Dark
|
||||
<span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=light]:hidden hx:group-data-[theme=system]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
|
||||
</p>
|
||||
</li>
|
||||
<li class="hx:flex hx:flex-col">
|
||||
<p
|
||||
data-item="system"
|
||||
class="hx:text-gray-800 hx:dark:text-gray-100 hx:hover:bg-primary-50 hx:hover:text-primary-600 hx:hover:dark:bg-primary-500/10 hx:hover:dark:text-primary-600 hx:relative hx:cursor-pointer hx:whitespace-nowrap hx:py-1.5 hx:transition-colors hx:ltr:pl-3 hx:ltr:pr-9 hx:rtl:pr-3 hx:rtl:pl-9"
|
||||
>
|
||||
System
|
||||
<span class="hx:absolute hx:inset-y-0 hx:flex hx:items-center hx:ltr:right-3 hx:rtl:left-3 hx:group-data-[theme=dark]:hidden hx:group-data-[theme=light]:hidden"><svg height=1em width=1em xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7"/></svg></span>
|
||||
</p>
|
||||
</li>
|
||||
</ul>
|
||||
</div></div></div></aside>
|
||||
|
||||
<nav class="hextra-toc hx:order-last hx:hidden hx:w-64 hx:shrink-0 hx:xl:block hx:print:hidden hx:px-4" aria-label="table of contents">
|
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<div class="hextra-scrollbar hx:sticky hx:top-16 hx:overflow-y-auto hx:pr-4 hx:pt-6 hx:text-sm [hyphens:auto] hx:max-h-[calc(100vh-var(--navbar-height)-env(safe-area-inset-bottom))] hx:ltr:-mr-4 hx:rtl:-ml-4"><p class="hx:mb-4 hx:font-semibold hx:tracking-tight">On this page</p><ul>
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<li class="hx:my-2 hx:scroll-my-6 hx:scroll-py-6">
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<a class="hx:font-medium hx:inline-block hx:text-gray-500 hx:hover:text-gray-900 hx:dark:text-gray-400 hx:dark:hover:text-gray-300 hx:contrast-more:text-gray-900 hx:contrast-more:underline hx:contrast-more:dark:text-gray-50 hx:w-full hx:break-words" href="#solution">Solution
|
||||
</a>
|
||||
</li></ul>
|
||||
<div class="hx:mt-8 hx:border-t hx:bg-white hx:pt-8 hx:shadow-[0_-12px_16px_white] hx:dark:bg-dark hx:dark:shadow-[0_-12px_16px_#111] hx:sticky hx:bottom-0 hx:flex hx:flex-col hx:items-start hx:gap-2 hx:pb-8 hx:border-gray-200 hx:dark:border-neutral-800 hx:contrast-more:border-t hx:contrast-more:border-neutral-400 hx:contrast-more:shadow-none hx:contrast-more:dark:border-neutral-400">
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<span>Scroll to top</span>
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<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="hx:inline hx:ltr:ml-1 hx:rtl:mr-1 hx:h-3.5 hx:w-3.5 hx:rounded-full hx:border hx:border-gray-500 hx:hover:border-gray-900 hx:dark:border-gray-400 hx:dark:hover:border-gray-100 hx:contrast-more:border-gray-800 hx:contrast-more:dark:border-gray-50">
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<article class="hx:w-full hx:break-words hx:flex hx:min-h-[calc(100vh-var(--navbar-height))] hx:min-w-0 hx:justify-center hx:pb-8 hx:pr-[calc(env(safe-area-inset-right)-1.5rem)]">
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<main class="hx:w-full hx:min-w-0 hx:max-w-6xl hx:px-6 hx:pt-4 hx:md:px-12">
|
||||
|
||||
<div class="content">
|
||||
<h1>SumBigDecimalHex</h1>
|
||||
<h1>Task</h1><ul>
|
||||
<li>Input data fits into <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html"target="_blank" rel="noopener">BigDecimal</a> data type</li>
|
||||
<li>There are decimal and hexadecimal numbers in input</li>
|
||||
<li>Hexadecimal numbers has <code>0x</code> prefix, so for example <code>0xbsc</code> equals <code>11·10⁻¹²</code> (mantissa and exponent are integers)</li>
|
||||
<li>Input is case insensitive</li>
|
||||
<li>Class should be named <code>SumBigDecimalHex</code></li>
|
||||
</ul>
|
||||
<h2>Solution<span class="hx:absolute hx:-mt-20" id="solution"></span>
|
||||
<a href="#solution" class="subheading-anchor" aria-label="Permalink for this section"></a></h2><p>This is the hardest (and last) modification for this homework.</p>
|
||||
<p>Let’s modify our <code>SumDoubleHex</code> <code>parseNumber</code> method. This is what it looks now</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> <span style="color:#66d9ef">double</span> <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
|
||||
</span></span><span style="display:flex;"><span> String numberString <span style="color:#f92672">=</span> number.<span style="color:#a6e22e">toString</span>();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (
|
||||
</span></span><span style="display:flex;"><span> numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0x"</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0X"</span>)
|
||||
</span></span><span style="display:flex;"><span> ) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">contains</span>(<span style="color:#e6db74">"."</span>)) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> Double.<span style="color:#a6e22e">parseDouble</span>(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> Long.<span style="color:#a6e22e">parseLong</span>(numberString.<span style="color:#a6e22e">substring</span>(2), 16);
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> Double.<span style="color:#a6e22e">parseDouble</span>(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> 0;
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>Let’s make some small changes:</p>
|
||||
<p>Firstly, let’s change the output data type to <code>BigDecimal</code>. So we will change this line</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> <span style="color:#66d9ef">double</span> <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>to this</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> BigDecimal <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>Also let’s change this line from the parsing of a decimal number option</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">return</span> Double.<span style="color:#a6e22e">parseDouble</span>(numberString);</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>to</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(numberString);</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>We will change this line</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">return</span> 0;</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>to</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">return</span> BigDecimal.<span style="color:#a6e22e">ZERO</span>;</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>as we did almost the same thing for <code>SumBigIntegerOctal</code> modification.</p>
|
||||
<p>Also let’s change our <code>numberString</code> to lowercase letters just for convenience</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><pre><code>String numberString = number.toString().toLowerCase();</code></pre></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Here we are using <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#toLowerCase--"target="_blank" rel="noopener"><code>String.toLowerCase()</code></a> method that converts all the characters to lower case.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<p>So our code will currently look like this</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> BigDecimal <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
|
||||
</span></span><span style="display:flex;"><span> String numberString <span style="color:#f92672">=</span> number.<span style="color:#a6e22e">toString</span>().<span style="color:#a6e22e">toLowerCase</span>(); <span style="color:#75715e">// toLowerCase() added</span>
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0x"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> numberString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(2);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> ( <span style="color:#75715e">/* numberString has "s" in it */</span> ) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#75715e">/* somehow parse number */</span>
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#75715e">/* somehow parse number */</span>
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> BigDecimal.<span style="color:#a6e22e">ZERO</span>;
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Notice, that we no longer need to check for <code>numberString</code> to begin with <code>"0X"</code>. Since there can’t be an upper case letter in the <code>numberString</code> after converting all of its letters to lower case.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Also in this line</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span>numberString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(2);</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>we strip off first two symbols (<code>0x</code>) in order for correct parsing later.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<p>Let’s solve our “comments” one-by-one.</p>
|
||||
<p>The easiest is to understand if there is an <code>"s"</code> in <code>numberString</code>. We can do so using <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#contains-java.lang.CharSequence-"target="_blank" rel="noopener"><code>String.contains(CharSequence s)</code></a> that returns true if and only if this string contains the specified sequence of char values. In our case the sequence of values will be <code>"s"</code>.</p>
|
||||
<p>Let’s apply this logic to our method</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> BigDecimal <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
|
||||
</span></span><span style="display:flex;"><span> String numberString <span style="color:#f92672">=</span> number.<span style="color:#a6e22e">toString</span>().<span style="color:#a6e22e">toLowerCase</span>();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0x"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> numberString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(2);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">contains</span>(<span style="color:#e6db74">"s"</span>)) { <span style="color:#75715e">// <--</span>
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#75715e">/* somehow parse number */</span>
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#75715e">/* somehow parse number */</span>
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> BigDecimal.<span style="color:#a6e22e">ZERO</span>;
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Again, we are not checking for upper case <code>"S"</code>, since there are no upper case letters in <code>numberString</code> because we used <code>.toLowerCase()</code>.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<p>Okay, now let’s parse our number if it doesn’t contain <code>"s"</code>. It’s actually very simple. First we need to convert it to <code>BigInteger</code> and then pass the result to <code>BigDecimal</code>. It will look like this</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#75715e">// using 16 to convert from hexadecimal to decimal </span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#75715e">// and only then passing to BigDecimal</span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(<span style="color:#66d9ef">new</span> BigInteger(numberString, 16)); </span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-purple-200 hx:bg-purple-100 hx:text-purple-900 hx:dark:border-purple-200/30 hx:dark:bg-purple-900/30 hx:dark:text-purple-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Important</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Here, we don’t assign <code>BigInteger</code> object to any variable so it is used only for conversion from hexadecimal to decimal. After it’s value is passed to <code>BigDecimal</code> a garbage collector can come and destroy it, since there is no way to access it anymore.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<p>We have only one “unsolved comment” left, but it’s going to require a bit of theory. So basically <code>s</code> splits our number in two parts: everything on the left is called a mantissa and on the right is exponent. So the form is basically the following</p>
|
||||
<span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mn>0</mn><mi>x</mi><mo stretchy="false">{</mo><mi>m</mi><mi>a</mi><mi>n</mi><mi>t</mi><mi>i</mi><mi>s</mi><mi>s</mi><mi>a</mi><mo stretchy="false">}</mo><mi>s</mi><mo stretchy="false">{</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>o</mi><mi>n</mi><mi>e</mi><mi>n</mi><mi>t</mi><mo stretchy="false">}</mo></mrow><annotation encoding="application/x-tex">
|
||||
0x\{mantissa\}s\{exponent\}
|
||||
</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">0</span><span class="mord mathnormal">x</span><span class="mopen">{</span><span class="mord mathnormal">man</span><span class="mord mathnormal">t</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ss</span><span class="mord mathnormal">a</span><span class="mclose">}</span><span class="mord mathnormal">s</span><span class="mopen">{</span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">p</span><span class="mord mathnormal">o</span><span class="mord mathnormal">n</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mord mathnormal">t</span><span class="mclose">}</span></span></span></span></span><p>In order to get the number we will first need to convert each part from hexadecimal to decimal. Exponent represents decimal places. For example <code>0xABs02</code>: <code>AB</code> in hex equals 171 in decimal, <code>02</code> means 2 decimal places, so we shift point (<code>.</code>) 2 places left and get 1.71. Mathematically we can shift a point (<code>.</code>) by multiplying 10 with some power (in our case exponent). But to shift left we need to first negate the exponent so the point (<code>.</code>) shifts left (not right).</p>
|
||||
<p>So the formula is</p>
|
||||
<span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mi>m</mi><mi>a</mi><mi>n</mi><mi>t</mi><mi>i</mi><mi>s</mi><mi>s</mi><mi>a</mi><mo>⋅</mo><msup><mn>10</mn><mrow><mo>−</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>o</mi><mi>n</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow></msup></mrow><annotation encoding="application/x-tex">
|
||||
mantissa \cdot 10^{-exponent}
|
||||
</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6595em;"></span><span class="mord mathnormal">man</span><span class="mord mathnormal">t</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ss</span><span class="mord mathnormal">a</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">⋅</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8436em;"></span><span class="mord">1</span><span class="mord"><span class="mord">0</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.8436em;"><span style="top:-3.113em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">−</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">x</span><span class="mord mathnormal mtight">p</span><span class="mord mathnormal mtight">o</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">t</span></span></span></span></span></span></span></span></span></span></span></span></span><p>Okay, we are done with theory, but how can we implement it in our code.</p>
|
||||
<p>First of all we need somehow to split our <code>numberString</code> by <code>"s"</code>. To do that we need to get the index at which <code>"s"</code> in placed. To do that we can use <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#indexOf-int-"target="_blank" rel="noopener"><code>String.indexOf(char ch)</code></a> method that returns the index of the first occurrence of the specified character (in our case <code>"s"</code>). Okay, then using <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#substring-int-"target="_blank" rel="noopener"><code>String.substring()</code></a> we can split into two parts. Here’s what it’s gonna look like</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">int</span> indexOfS <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">indexOf</span>(<span style="color:#e6db74">'s'</span>);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#75715e">// all characters before 's', without including 's' itself</span>
|
||||
</span></span><span style="display:flex;"><span>String mantissaHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(0, indexOfS);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#75715e">// all characters after 's', without including 's' itself</span>
|
||||
</span></span><span style="display:flex;"><span>String exponentHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(indexOfS <span style="color:#f92672">+</span> 1);</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>Note, that we use <code>'s'</code> (not <code>"s"</code>) in <code>indexOf</code> method. That’s because it uses <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Character.html"target="_blank" rel="noopener"><code>char</code></a> data type as its argument, but <code>"s"</code> is a string. So we need single quotes in order to represent <code>char</code>.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="hx:overflow-x-auto hx:mt-6 hx:flex hx:flex-col hx:rounded-lg hx:border hx:py-4 hx:px-4 hx:border-gray-200 hx:contrast-more:border-current hx:contrast-more:dark:border-current hx:border-blue-200 hx:bg-blue-100 hx:text-blue-900 hx:dark:border-blue-200/30 hx:dark:bg-blue-900/30 hx:dark:text-blue-200">
|
||||
<p class="hx:flex hx:items-center hx:font-medium"><svg height=16px class="hx:inline-block hx:align-middle hx:mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" aria-hidden="true"><path stroke-linecap="round" stroke-linejoin="round" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>Note</p>
|
||||
|
||||
<div class="hx:w-full hx:min-w-0 hx:leading-7">
|
||||
<div class="hx:mt-6 hx:leading-7 hx:first:mt-0"><p>When extracting exponent we can use only one argument (<code>indexOfS + 1</code>), because it will automatically go to the end of the string itself.</p></div>
|
||||
</div>
|
||||
</div>
|
||||
<p>Okay, now that we have <code>mantissaHexString</code> and <code>exponentHexString</code> we just need to convert them into decimal. That we know how to do using <code>BigInteger</code> with base specifier.</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span>BigInteger mantissa <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(mantissaHexString, 16);
|
||||
</span></span><span style="display:flex;"><span>BigInteger exponent <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(exponentHexString, 16);</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>Okay, one thing left is to use the formula that we got</p>
|
||||
<span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mi>m</mi><mi>a</mi><mi>n</mi><mi>t</mi><mi>i</mi><mi>s</mi><mi>s</mi><mi>a</mi><mo>⋅</mo><msup><mn>10</mn><mrow><mo>−</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>o</mi><mi>n</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow></msup></mrow><annotation encoding="application/x-tex">
|
||||
mantissa \cdot 10^{-exponent}
|
||||
</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6595em;"></span><span class="mord mathnormal">man</span><span class="mord mathnormal">t</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ss</span><span class="mord mathnormal">a</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">⋅</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:0.8436em;"></span><span class="mord">1</span><span class="mord"><span class="mord">0</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.8436em;"><span style="top:-3.113em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">−</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">x</span><span class="mord mathnormal mtight">p</span><span class="mord mathnormal mtight">o</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">t</span></span></span></span></span></span></span></span></span></span></span></span></span><p>I will write the solution first and explain it right after</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(mantissa).<span style="color:#a6e22e">scaleByPowerOfTen</span>(exponent.<span style="color:#a6e22e">negate</span>().<span style="color:#a6e22e">intValueExact</span>());</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>Here we are using <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html#scaleByPowerOfTen-int-"target="_blank" rel="noopener"><code>BigDecimal.scaleByPowerOfTen(int n)</code></a> method to basically multiply by <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mn>10</mn><mrow><mo>−</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>o</mi><mi>n</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow></msup></mrow><annotation encoding="application/x-tex">10^{-exponent}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7936em;"></span><span class="mord">1</span><span class="mord"><span class="mord">0</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7936em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">−</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">x</span><span class="mord mathnormal mtight">p</span><span class="mord mathnormal mtight">o</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">e</span><span class="mord mathnormal mtight">n</span><span class="mord mathnormal mtight">t</span></span></span></span></span></span></span></span></span></span></span></span>. Then we use <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#negate--"target="_blank" rel="noopener"><code>BigInteger.negate()</code></a> to basically multiply by -1. And finally we use <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#intValueExact--"target="_blank" rel="noopener"><code>BigInteger.intValueExact()</code></a> to get the integer value. We do that because <code>scaleByPowerOfTen</code> method recieves integer argument (not <code>BigInteger</code>).</p>
|
||||
<p>So our method will look like this</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">static</span> BigDecimal <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
|
||||
</span></span><span style="display:flex;"><span> String numberString <span style="color:#f92672">=</span> number.<span style="color:#a6e22e">toString</span>().<span style="color:#a6e22e">toLowerCase</span>();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0x"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> numberString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(2);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">contains</span>(<span style="color:#e6db74">"s"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> indexOfS <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">indexOf</span>(<span style="color:#e6db74">'s'</span>);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> String mantissaHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(0, indexOfS);
|
||||
</span></span><span style="display:flex;"><span> String exponentHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(indexOfS <span style="color:#f92672">+</span> 1);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> BigInteger mantissa <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(mantissaHexString, 16);
|
||||
</span></span><span style="display:flex;"><span> BigInteger exponent <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(exponentHexString, 16);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(mantissa).<span style="color:#a6e22e">scaleByPowerOfTen</span>(exponent.<span style="color:#a6e22e">negate</span>().<span style="color:#a6e22e">intValueExact</span>());
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(<span style="color:#66d9ef">new</span> BigInteger(numberString, 16));
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> BigDecimal.<span style="color:#a6e22e">ZERO</span>;
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>Okay, now let’s change <code>main</code> method accordingly. Let’s take <code>main</code> method from <code>SumBigIntegerOctal</code> modification. Here’s what it looks like now</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">main</span>(String<span style="color:#f92672">[]</span> args) {
|
||||
</span></span><span style="display:flex;"><span> BigInteger sum <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(<span style="color:#e6db74">"0"</span>);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">for</span> (String argument : args) {
|
||||
</span></span><span style="display:flex;"><span> StringBuilder number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">for</span> (<span style="color:#66d9ef">char</span> c : argument.<span style="color:#a6e22e">toCharArray</span>()) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>Character.<span style="color:#a6e22e">isWhitespace</span>(c)) {
|
||||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">append</span>(c);
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">=</span> sum.<span style="color:#a6e22e">add</span>(parseNumber(number));
|
||||
</span></span><span style="display:flex;"><span> number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">=</span> sum.<span style="color:#a6e22e">add</span>(parseNumber(number));
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> System.<span style="color:#a6e22e">out</span>.<span style="color:#a6e22e">println</span>(sum);
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>All we need to do is to replace the sum type from <code>BigInteger</code> to <code>BigDecimal</code>. So full code will look like this</p>
|
||||
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
|
||||
|
||||
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#75715e">// SumBigDecimalHex.java</span>
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#f92672">import</span> java.math.BigDecimal;
|
||||
</span></span><span style="display:flex;"><span><span style="color:#f92672">import</span> java.math.BigInteger;
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">SumBigDecimalHex</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">main</span>(String<span style="color:#f92672">[]</span> args) {
|
||||
</span></span><span style="display:flex;"><span> BigDecimal sum <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigDecimal(<span style="color:#e6db74">"0"</span>);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">for</span> (String argument : args) {
|
||||
</span></span><span style="display:flex;"><span> StringBuilder number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">for</span> (<span style="color:#66d9ef">char</span> c : argument.<span style="color:#a6e22e">toCharArray</span>()) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>Character.<span style="color:#a6e22e">isWhitespace</span>(c)) {
|
||||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">append</span>(c);
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">=</span> sum.<span style="color:#a6e22e">add</span>(parseNumber(number));
|
||||
</span></span><span style="display:flex;"><span> number <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuilder();
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">=</span> sum.<span style="color:#a6e22e">add</span>(parseNumber(number));
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> System.<span style="color:#a6e22e">out</span>.<span style="color:#a6e22e">println</span>(sum);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">static</span> BigDecimal <span style="color:#a6e22e">parseNumber</span>(StringBuilder number) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>number.<span style="color:#a6e22e">isEmpty</span>()) {
|
||||
</span></span><span style="display:flex;"><span> String numberString <span style="color:#f92672">=</span> number.<span style="color:#a6e22e">toString</span>().<span style="color:#a6e22e">toLowerCase</span>();
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">"0x"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> numberString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(2);
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">contains</span>(<span style="color:#e6db74">"s"</span>)) {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">int</span> indexOfS <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">indexOf</span>(<span style="color:#e6db74">'s'</span>);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> String mantissaHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(0, indexOfS);
|
||||
</span></span><span style="display:flex;"><span> String exponentHexString <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">substring</span>(indexOfS <span style="color:#f92672">+</span> 1);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> BigInteger mantissa <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(mantissaHexString, 16);
|
||||
</span></span><span style="display:flex;"><span> BigInteger exponent <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(exponentHexString, 16);
|
||||
</span></span><span style="display:flex;"><span>
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(mantissa).<span style="color:#a6e22e">scaleByPowerOfTen</span>(exponent.<span style="color:#a6e22e">negate</span>().<span style="color:#a6e22e">intValueExact</span>());
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(<span style="color:#66d9ef">new</span> BigInteger(numberString, 16));
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigDecimal(numberString);
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> } <span style="color:#66d9ef">else</span> {
|
||||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> BigDecimal.<span style="color:#a6e22e">ZERO</span>;
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span> }
|
||||
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
|
||||
<button
|
||||
class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
|
||||
title="Copy code"
|
||||
>
|
||||
<div class="hextra-copy-icon hx:group-[.copied]/copybtn:hidden hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
<div class="hextra-success-icon hx:hidden hx:group-[.copied]/copybtn:block hx:pointer-events-none hx:h-4 hx:w-4"></div>
|
||||
</button>
|
||||
</div>
|
||||
</div>
|
||||
<p>This code works correctly and passes all the tests!</p>
|
||||
|
||||
</div>
|
||||
<div class="hx:mt-16"></div>
|
||||
<div class="hx:mt-16"></div>
|
||||
|
||||
</main>
|
||||
</article>
|
||||
</div>
|
||||
|
||||
|
||||
|
||||
|
||||
<script defer src="/js/main.js" integrity=""></script>
|
||||
<script defer src="/js/flexsearch.9f5b5908f93ae86f1ecd4b043b799f580c2d1654e703dd9357d568ac41b2547a.js" integrity="sha256-n1tZCPk66G8ezUsEO3mfWAwtFlTnA92TV9VorEGyVHo=" crossorigin="anonymous"></script>
|
||||
<script defer src="/en.search.js" integrity=""></script>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user