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<meta name="description" content="Task Input data fits into BigInteger data type. Octal numbers ends with o. Class should be named SumBigIntegerOctal. Solution Let’s change our parseNumber method code from SumLongOctal modification. Here’s what it looked like
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static long parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); int numberStringLength = numberString.length(); if (numberString.endsWith("o") || numberString.endsWith("O")) { return new BigInteger( number.substring(0, numberStringLength - 1), 8 ).longValue(); } else { return Long.parseLong(numberString); } } else { return 0; } } First of all let’s change the output type of our method to BigInteger." /><link rel="canonical" href="http://localhost:1313/courses/prog-intro/homeworks/sum/sumbigintegeroctal/" itemprop="url" />
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<meta itemprop="description" content="Task Input data fits into BigInteger data type. Octal numbers ends with o. Class should be named SumBigIntegerOctal. Solution Let’s change our parseNumber method code from SumLongOctal modification. Here’s what it looked like
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static long parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); int numberStringLength = numberString.length(); if (numberString.endsWith("o") || numberString.endsWith("O")) { return new BigInteger( number.substring(0, numberStringLength - 1), 8 ).longValue(); } else { return Long.parseLong(numberString); } } else { return 0; } } First of all let’s change the output type of our method to BigInteger.">
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<meta name="twitter:description" content="Task Input data fits into BigInteger data type. Octal numbers ends with o. Class should be named SumBigIntegerOctal. Solution Let’s change our parseNumber method code from SumLongOctal modification. Here’s what it looked like
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static long parseNumber(StringBuilder number) { if (!number.isEmpty()) { String numberString = number.toString(); int numberStringLength = numberString.length(); if (numberString.endsWith("o") || numberString.endsWith("O")) { return new BigInteger( number.substring(0, numberStringLength - 1), 8 ).longValue(); } else { return Long.parseLong(numberString); } } else { return 0; } } First of all let’s change the output type of our method to BigInteger.">
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>Introduction to Programming in Java
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>Homeworks
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href="/courses/prog-intro/homeworks/sum/"
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>Sum
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href="/courses/prog-intro/homeworks/sum/sumbigdecimalhex/"
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>SumBigDecimalHex
|
||
</a>
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|
||
</li><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/sumbigintegeroctal/"
|
||
|
||
>SumBigIntegerOctal
|
||
</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/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 "><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/sumbigdecimalhex/"
|
||
|
||
>SumBigDecimalHex
|
||
</a>
|
||
|
||
</li><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/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>
|
||
|
||
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|
||
href="/courses/prog-intro/homeworks/sum/conclusion/"
|
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|
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>Summing Up
|
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</a>
|
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|
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</li></ul>
|
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href="/courses/prog-intro/lectures/intro/"
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|
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>Lecture 1. Introduction
|
||
</a>
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|
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href="/courses/paradigms/"
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|
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>Paradgims of Programming
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</a>
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<div class="content">
|
||
<h1>SumBigIntegerOctal</h1>
|
||
<h1>Task</h1><ul>
|
||
<li>Input data fits into <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html"target="_blank" rel="noopener"><code>BigInteger</code></a> data type.</li>
|
||
<li>Octal numbers ends with <code>o</code>.</li>
|
||
<li>Class should be named <code>SumBigIntegerOctal</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>Let’s change our <code>parseNumber</code> method code from <code>SumLongOctal</code> modification. Here’s what it looked like</p>
|
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<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
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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:#66d9ef">static</span> <span style="color:#66d9ef">long</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">int</span> numberStringLength <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">length</span>();
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"o"</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"O"</span>)) {
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigInteger(
|
||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">substring</span>(0, numberStringLength <span style="color:#f92672">-</span> 1),
|
||
</span></span><span style="display:flex;"><span> 8
|
||
</span></span><span style="display:flex;"><span> ).<span style="color:#a6e22e">longValue</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> Long.<span style="color:#a6e22e">parseLong</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"
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title="Copy code"
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>
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</button>
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</div>
|
||
</div>
|
||
<p>First of all let’s change the output type of our method to <code>BigInteger</code>.</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> BigInteger <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">
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title="Copy code"
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>
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</button>
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</div>
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</div>
|
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<p>Also in case of an empty number we can’t just <code>return 0</code> anymore because it doesn’t have <code>BigInteger</code> data type. Instead we are going to return <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#ZERO"target="_blank" rel="noopener"><code>BigInteger.ZERO</code></a>.</p>
|
||
<p>Here we can get rid of <code>.longValue()</code> because we just need straight <code>BigInteger</code> type.</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> BigInteger(number.<span style="color:#a6e22e">substring</span>(0, numberStringLength <span style="color:#f92672">-</span> 1), 8); <span style="color:#f92672">//</span> .<span style="color:#a6e22e">longValue</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>Also we change 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">return</span> Long.<span style="color:#a6e22e">parseLong</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 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">return</span> <span style="color:#66d9ef">new</span> BigInteger(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>for the same reason. So the <code>parseNumber</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:#66d9ef">static</span> BigInteger <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">int</span> numberStringLength <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">length</span>();
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"o"</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"O"</span>)) {
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigInteger(
|
||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">substring</span>(0, numberStringLength <span style="color:#f92672">-</span> 1),
|
||
</span></span><span style="display:flex;"><span> 8
|
||
</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> <span style="color:#66d9ef">new</span> BigInteger(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> BigInteger.<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>Let’s rework our <code>main</code> method as well. 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> <span style="color:#66d9ef">int</span> sum <span style="color:#f92672">=</span> 0;
|
||
</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> 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> 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>First of all, let’s change the data type of <code>sum</code> to <code>BigInteger</code> 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>BigInteger sum <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> BigInteger(<span style="color:#e6db74">"0"</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-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>Notice, we can’t just do <code>new BigInteger()</code> (without any arguments) like we did with <code>StringBuilder</code>. We need to put the initial value as an argument like <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#BigInteger-java.lang.String-"target="_blank" rel="noopener"><code>new BigInteger(String val)</code></a>.</p></div>
|
||
</div>
|
||
</div>
|
||
<p>So in this stage our 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">// SumBigIntegerOctal.java</span>
|
||
</span></span><span style="display:flex;"><span>
|
||
</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">SumBigIntegerOctal</span> {
|
||
</span></span><span style="display:flex;"><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> 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> 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> 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 style="color:#66d9ef">static</span> BigInteger <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">int</span> numberStringLength <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">length</span>();
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"o"</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"O"</span>)) {
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigInteger(
|
||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">substring</span>(0, numberStringLength <span style="color:#f92672">-</span> 1),
|
||
</span></span><span style="display:flex;"><span> 8
|
||
</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> <span style="color:#66d9ef">new</span> BigInteger(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> BigInteger.<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>And let’s try to compile 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-bash" data-lang="bash"><span style="display:flex;"><span>$ javac SumBigIntegerOctal.java
|
||
</span></span><span style="display:flex;"><span>SumBigIntegerOctal.java:15: error: bad operand types <span style="color:#66d9ef">for</span> binary operator <span style="color:#e6db74">'+'</span>
|
||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">+=</span> parseNumber<span style="color:#f92672">(</span>number<span style="color:#f92672">)</span>;
|
||
</span></span><span style="display:flex;"><span> ^
|
||
</span></span><span style="display:flex;"><span> first type: BigInteger
|
||
</span></span><span style="display:flex;"><span> second type: BigInteger
|
||
</span></span><span style="display:flex;"><span>SumBigIntegerOctal.java:20: error: bad operand types <span style="color:#66d9ef">for</span> binary operator <span style="color:#e6db74">'+'</span>
|
||
</span></span><span style="display:flex;"><span> sum <span style="color:#f92672">+=</span> parseNumber<span style="color:#f92672">(</span>number<span style="color:#f92672">)</span>;
|
||
</span></span><span style="display:flex;"><span> ^
|
||
</span></span><span style="display:flex;"><span> first type: BigInteger
|
||
</span></span><span style="display:flex;"><span> second type: BigInteger
|
||
</span></span><span style="display:flex;"><span><span style="color:#ae81ff">2</span> errors</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>We can’t use <code>+</code> operand with <code>BigInteger</code> data type. Instead we need to use <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#add-java.math.BigInteger-"target="_blank" rel="noopener"><code>BigInteger.add(BigInteger val)</code></a>.</p></div>
|
||
</div>
|
||
</div>
|
||
<p>So we will modify like so</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">// SumBigIntegerOctal.java</span>
|
||
</span></span><span style="display:flex;"><span>
|
||
</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">SumBigIntegerOctal</span> {
|
||
</span></span><span style="display:flex;"><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> 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><span style="display:flex;"><span>
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">static</span> BigInteger <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">int</span> numberStringLength <span style="color:#f92672">=</span> numberString.<span style="color:#a6e22e">length</span>();
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">if</span> (numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"o"</span>) <span style="color:#f92672">||</span> numberString.<span style="color:#a6e22e">endsWith</span>(<span style="color:#e6db74">"O"</span>)) {
|
||
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> BigInteger(
|
||
</span></span><span style="display:flex;"><span> number.<span style="color:#a6e22e">substring</span>(0, numberStringLength <span style="color:#f92672">-</span> 1),
|
||
</span></span><span style="display:flex;"><span> 8
|
||
</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> <span style="color:#66d9ef">new</span> BigInteger(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> BigInteger.<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>And this code will pass all the tests!</p>
|
||
|
||
</div>
|
||
<div class="hx:mt-16"></div>
|
||
<div class="hx:mt-16"></div>
|
||
|
||
</main>
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||
</article>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<script defer src="/js/main.js" integrity=""></script>
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