75 lines
1.7 KiB
Markdown
75 lines
1.7 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244ae
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/cWP24Ub'
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forumTopicId: 18184
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title: 求余运算
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---
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## Description
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<section id='description'>
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<dfn>remainder</dfn>求余运算符<code>%</code>返回两个数相除得到的余数
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<strong>示例</strong>
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<blockquote>5 % 2 = 1 因为<br>Math.floor(5 / 2) = 2 （商）<br>2 * 2 = 4<br>5 - 4 = 1 （余数）</blockquote>
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<strong>用法</strong><br>在数学中，判断一个数是奇数还是偶数，只需要判断这个数除以 2 得到的余数是 0 还是 1。
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<blockquote>17 % 2 = 1（17 是奇数）<br>48 % 2 = 0（48 是偶数）</blockquote>
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<strong>提示<strong><br>余数运算符(<dfn>remainder</dfn>)有时被错误地称为“模数”运算符。它与模数非常相似，但不能用于负数的运算。
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</section>
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## Instructions
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<section id='instructions'>
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使用<code>%</code>运算符，计算 11 除以 3 的余数，并把余数赋给变量 remainder。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 变量<code>remainder</code>应该被初始化。
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testString: assert(/var\s+?remainder/.test(code));
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- text: <code>remainder</code>的值应该等于<code>2</code>。
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testString: assert(remainder === 2);
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- text: 你应该使用<code>%</code>运算符。
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testString: assert(/\s+?remainder\s*?=\s*?.*%.*;/.test(code));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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// Only change code below this line
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var remainder;
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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(function(y){return 'remainder = '+y;})(remainder);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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var remainder = 11 % 3;
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```
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</section>
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