2018-10-10 18:03:03 -04:00
|
|
|
|
---
|
|
|
|
|
|
id: a302f7aae1aa3152a5b413bc
|
|
|
|
|
|
title: Factorialize a Number
|
|
|
|
|
|
isRequired: true
|
|
|
|
|
|
challengeType: 5
|
|
|
|
|
|
videoUrl: ''
|
|
|
|
|
|
localeTitle: 对一个数字进行推理
|
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
|
|
## Description
|
2019-11-19 19:54:48 -05:00
|
|
|
|
<section id="description">返回提供的整数的阶乘。如果整数用字母n表示，则阶乘是所有小于或等于n的正整数的乘积。因子通常用简写符号<code>n!</code>表示<code>n!</code>例如： <code>5! = 1 * 2 * 3 * 4 * 5 = 120</code>只有大于或等于零的整数才会被提供给该函数。如果卡住，请记得使用<a href="https://www.freecodecamp.org/forum/t/how-to-get-help-when-you-are-stuck-coding/19514" target="_blank">Read-Search-Ask</a> 。编写自己的代码。 </section>
|
2018-10-10 18:03:03 -04:00
|
|
|
|
|
|
|
|
|
|
## Instructions
|
|
|
|
|
|
<section id="instructions">
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
|
|
## Tests
|
|
|
|
|
|
<section id='tests'>
|
|
|
|
|
|
|
|
|
|
|
|
```yml
|
|
|
|
|
|
tests:
|
|
|
|
|
|
- text: <code>factorialize(5)</code>应该返回一个数字。
|
|
|
|
|
|
testString: 'assert(typeof factorialize(5) === "number", "<code>factorialize(5)</code> should return a number.");'
|
|
|
|
|
|
- text: <code>factorialize(5)</code>应该返回120。
|
|
|
|
|
|
testString: 'assert(factorialize(5) === 120, "<code>factorialize(5)</code> should return 120.");'
|
|
|
|
|
|
- text: <code>factorialize(10)</code>应返回3628800。
|
|
|
|
|
|
testString: 'assert(factorialize(10) === 3628800, "<code>factorialize(10)</code> should return 3628800.");'
|
|
|
|
|
|
- text: <code>factorialize(20)</code>应该返回2432902008176640000。
|
|
|
|
|
|
testString: 'assert(factorialize(20) === 2432902008176640000, "<code>factorialize(20)</code> should return 2432902008176640000.");'
|
|
|
|
|
|
- text: <code>factorialize(0)</code>应该返回1。
|
|
|
|
|
|
testString: 'assert(factorialize(0) === 1, "<code>factorialize(0)</code> should return 1.");'
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
|
|
## Challenge Seed
|
|
|
|
|
|
<section id='challengeSeed'>
|
|
|
|
|
|
|
|
|
|
|
|
<div id='js-seed'>
|
|
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
|
function factorialize(num) {
|
|
|
|
|
|
return num;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
factorialize(5);
|
|
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
|
|
## Solution
|
|
|
|
|
|
<section id='solution'>
|
|
|
|
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
|
// solution required
|
|
|
|
|
|
```
|
|
|
|
|
|
</section>
|
