60 lines
1.5 KiB
Markdown
60 lines
1.5 KiB
Markdown
---
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id: 5900f3941000cf542c50fea7
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challengeType: 5
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videoUrl: ''
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title: 问题40：Champernowne的常数
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---
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## Description
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<section id="description">通过连接正整数创建无理小数： <span style="display: block; text-align: center;">0.12345678910 <b style="color: red;">1</b> 112131415161718192021 ...</span>可以看出小数部分的<sup>第</sup> 12位是1.如果<i>d <sub>n</sub></i>代表小数部分的<sup>第</sup> <i>n</i>位，找到值以下表达式。 <span style="display: block; text-align: center;">d <sub>1</sub> ×d <sub>10</sub> ×d <sub>100</sub> ×d <sub>1000</sub> ×d <sub>10000</sub> ×d <sub>100000</sub> ×d <sub>1000000</sub></span> </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>champernownesConstant(100)</code>应该返回5。
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testString: assert.strictEqual(champernownesConstant(100), 5);
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- text: <code>champernownesConstant(1000)</code>应该返回15。
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testString: assert.strictEqual(champernownesConstant(1000), 15);
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- text: <code>champernownesConstant(1000000)</code>应该返回210。
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testString: assert.strictEqual(champernownesConstant(1000000), 210);
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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 champernownesConstant(n) {
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// Good luck!
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return true;
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}
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champernownesConstant(100);
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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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