freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-an.../basic-javascript/finding-a-remainder-in-java...

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---
id: 56533eb9ac21ba0edf2244ae
title: 求余运算
challengeType: 1
videoUrl: 'https://scrimba.com/c/cWP24Ub'
forumTopicId: 18184
dashedName: finding-a-remainder-in-javascript
---
# --description--
<dfn>remainder</dfn> 求余运算符 `%` 返回两个数相除得到的余数
**示例**
<blockquote>5 % 2 = 1 因为<br>Math.floor(5 / 2) = 2 (商)<br>2 * 2 = 4<br>5 - 4 = 1 (余数)</blockquote>
**用法**
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。
<blockquote>17 % 2 = 117 是奇数)<br>48 % 2 = 048 是偶数)</blockquote>
**提示**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。
# --instructions--
使用 <dfn>remainder</dfn> `%`)运算符,计算 `11` 除以 `3` 的余数,并把余数赋给变量 `remainder`
# --hints--
变量 `remainder` 应该被初始化。
```js
assert(/(const|let|var)\s+?remainder/.test(code));
```
`remainder` 的值应该等于 `2`
```js
assert(remainder === 2);
```
你应该使用 `%` 运算符。
```js
assert(/\s+?remainder\s*?=\s*?.*%.*;?/.test(code));
```
# --seed--
## --after-user-code--
```js
(function(y){return 'remainder = '+y;})(remainder);
```
## --seed-contents--
```js
const remainder = 0;
```
# --solutions--
```js
const remainder = 11 % 3;
```