67 lines
3.2 KiB
Markdown
67 lines
3.2 KiB
Markdown
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---
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title: Gray code
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id: 5a23c84252665b21eecc7e80
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challengeType: 5
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videoUrl: ''
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localeTitle: 格雷码
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---
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## Description
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<section id="description"> <a href="https://en.wikipedia.org/wiki/Gray code">格雷码</a>是二进制编码的一种形式，其中连续数字之间的转换仅相差一位。这是一种有用的编码，用于减少硬件数据危险，其值快速变化和/或连接到较慢的硬件作为输入。从左到右或从上到下依次为<a href="https://en.wikipedia.org/wiki/Karnaugh map">卡诺图</a>生成输入也很有用。创建一个函数来编码数字并解码格雷码中的数字。该函数应该有2个参数。第一个是布尔值。该函数应编码为true，解码为false。第二个参数是要编码/解码的数字。显示所有5位二进制数的正常二进制表示，格雷码表示和解码格雷码值（0-31包括0，不需要前导0）。有许多可能的格雷码。以下编码所谓的“二进制反射格雷码”。 <br>编码（MSB为0位，b为二进制，g为格雷码）： <code><br> if b[i-1] = 1 <br> <span style="padding-left:1em">g[i] = not b[i]</span> <br> else <br> <span style="padding-left:1em">g[i] = b[i]</span> <br></code>要么： <br> <code>g = b xor (b logically right shifted 1 time)</code> <br>解码（MSB为0位，b为二进制，g为格雷码）： <br> <code>b[0] = g[0] <br> for other bits: <br> b[i] = g[i] xor b[i-1] <br></code> </section>
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## Instructions
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<section id="instructions">
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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: <code>gray</code>应该是一个功能。
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testString: 'assert(typeof gray=="function","<code>gray</code> should be a function.");'
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- text: '<code>gray(true,177)</code>应该返回一个数字。'
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testString: 'assert(typeof gray(true,177)=="number","<code>gray(true,177)</code> should return a number.");'
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- text: '<code>gray(true,177)</code>应该返回<code>233</code> 。'
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testString: 'assert.equal(gray(true,177),233,"<code>gray(true,177)</code> should return <code>233</code>.");'
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- text: '<code>gray(true,425)</code>应该返回<code>381</code> 。'
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testString: 'assert.equal(gray(true,425),381,"<code>gray(true,425)</code> should return <code>381</code>.");'
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- text: '<code>gray(true,870)</code>应该返回<code>725</code> 。'
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testString: 'assert.equal(gray(true,870),725,"<code>gray(true,870)</code> should return <code>725</code>.");'
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- text: '<code>gray(false,233)</code>应该返回<code>177</code> 。'
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testString: 'assert.equal(gray(false,233),177,"<code>gray(false,233)</code> should return <code>177</code>.");'
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- text: '<code>gray(false,381)</code>应该返回<code>425</code> 。'
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testString: 'assert.equal(gray(false,381),425,"<code>gray(false,381)</code> should return <code>425</code>.");'
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- text: '<code>gray(false,725)</code>应该返回<code>870</code> 。'
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testString: 'assert.equal(gray(false,725),870,"<code>gray(false,725)</code> should return <code>870</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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function gray(enc, number) {
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// Good luck!
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}
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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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// solution required
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```
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</section>
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