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// SumBigDecimalHex.java
import java.math.BigDecimal;
import java.math.BigInteger;
public class SumBigDecimalHex {
public static void main(String[] args) {
BigDecimal sum = new BigDecimal("0");
for (String argument : args) {
StringBuilder number = new StringBuilder();
for (char c : argument.toCharArray()) {
if (!Character.isWhitespace(c)) {
number.append(c);
} else {
sum = sum.add(parseNumber(number));
number = new StringBuilder();
}
}
sum = sum.add(parseNumber(number));
}
System.out.println(sum);
}
static BigDecimal parseNumber(StringBuilder number) {
if (!number.isEmpty()) {
String numberString = number.toString().toLowerCase();
if (numberString.startsWith("0x")) {
numberString = numberString.substring(2);
if (numberString.contains("s")) {
int indexOfS = numberString.indexOf('s');
String mantissaHexString = numberString.substring(0, indexOfS);
String exponentHexString = numberString.substring(indexOfS + 1);
BigInteger mantissa = new BigInteger(mantissaHexString, 16);
BigInteger exponent = new BigInteger(exponentHexString, 16);
return new BigDecimal(mantissa).scaleByPowerOfTen(exponent.negate().intValueExact());
}
return new BigDecimal(new BigInteger(numberString, 16));
} else {
return new BigDecimal(numberString);
}
} else {
return BigDecimal.ZERO;
}
}
}

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<title>SumBigDecimalHex CodeJava</title>
<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.
Lets modify our SumDoubleHex parseNumber method. This is what it looks now
static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith(&#34;0x&#34;) || numberString.startsWith(&#34;0X&#34;) ) { if (numberString.contains(&#34;.&#34;)) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Lets 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.
Lets modify our SumDoubleHex parseNumber method. This is what it looks now
static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith(&#34;0x&#34;) || numberString.startsWith(&#34;0X&#34;) ) { if (numberString.contains(&#34;.&#34;)) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Lets 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.
Lets modify our SumDoubleHex parseNumber method. This is what it looks now
static double parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); if ( numberString.startsWith(&#34;0x&#34;) || numberString.startsWith(&#34;0X&#34;) ) { if (numberString.contains(&#34;.&#34;)) { return Double.parseDouble(numberString); } return Long.parseLong(numberString.substring(2), 16); } else { return Double.parseDouble(numberString); } } else { return 0; } } Lets make some small changes:">
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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"
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<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&rsquo;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">&#34;0x&#34;</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">startsWith</span>(<span style="color:#e6db74">&#34;0X&#34;</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">&#34;.&#34;</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">
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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"
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<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&rsquo;s make some small changes:</p>
<p>Firstly, let&rsquo;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&rsquo;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&rsquo;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">&#34;0x&#34;</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 &#34;s&#34; 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>&quot;0X&quot;</code>. Since there can&rsquo;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&rsquo;s solve our &ldquo;comments&rdquo; one-by-one.</p>
<p>The easiest is to understand if there is an <code>&quot;s&quot;</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>&quot;s&quot;</code>.</p>
<p>Let&rsquo;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">&#34;0x&#34;</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">&#34;s&#34;</span>)) { <span style="color:#75715e">// &lt;--</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>&quot;S&quot;</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&rsquo;s parse our number if it doesn&rsquo;t contain <code>&quot;s&quot;</code>. It&rsquo;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&rsquo;t assign <code>BigInteger</code> object to any variable so it is used only for conversion from hexadecimal to decimal. After it&rsquo;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 &ldquo;unsolved comment&rdquo; left, but it&rsquo;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>&quot;s&quot;</code>. To do that we need to get the index at which <code>&quot;s&quot;</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>&quot;s&quot;</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&rsquo;s what it&rsquo;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">&#39;s&#39;</span>);
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#75715e">// all characters before &#39;s&#39;, without including &#39;s&#39; 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 &#39;s&#39;, without including &#39;s&#39; 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">
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<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>&quot;s&quot;</code>) in <code>indexOf</code> method. That&rsquo;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>&quot;s&quot;</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">
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title="Copy code"
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<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">
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<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">&#34;0x&#34;</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">&#34;s&#34;</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">&#39;s&#39;</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">
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<p>Okay, now let&rsquo;s change <code>main</code> method accordingly. Let&rsquo;s take <code>main</code> method from <code>SumBigIntegerOctal</code> modification. Here&rsquo;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">&#34;0&#34;</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">
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<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>
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<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">&#34;0&#34;</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">&#34;0x&#34;</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">&#34;s&#34;</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">&#39;s&#39;</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">
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<p>This code works correctly and passes all the tests!</p>
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