ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
96 lines
1.5 KiB
Markdown
96 lines
1.5 KiB
Markdown
---
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id: 5a23c84252665b21eecc7ec1
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title: 迭代的数字平方
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challengeType: 5
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videoUrl: ''
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dashedName: iterated-digits-squaring
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---
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# --description--
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如果添加自然数（大于零的整数）的数字的平方，则始终以1或89结尾：
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```
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15 - > 26 - > 40 - > 16 - > 37 - > 58 - > 89
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7 - > 49 - > 97 - > 130 - > 10 - > 1
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```
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编写一个函数，该函数将数字作为参数，并在执行上述过程后返回1或89。
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# --hints--
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`iteratedSquare`应该是一个函数。
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```js
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assert(typeof iteratedSquare == 'function');
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```
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`iteratedSquare(4)`应该返回一个数字。
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```js
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assert(typeof iteratedSquare(4) == 'number');
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```
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`iteratedSquare(4)`应该返回`89` 。
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```js
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assert.equal(iteratedSquare(4), 89);
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```
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`iteratedSquare(7)`应该返回`1` 。
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```js
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assert.equal(iteratedSquare(7), 1);
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```
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`iteratedSquare(15)`应该返回`89` 。
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```js
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assert.equal(iteratedSquare(15), 89);
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```
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`iteratedSquare(20)`应该返回`89` 。
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```js
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assert.equal(iteratedSquare(20), 89);
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```
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`iteratedSquare(70)`应该返回`1` 。
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```js
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assert.equal(iteratedSquare(70), 1);
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```
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`iteratedSquare(100)`应该返回`1` 。
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```js
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assert.equal(iteratedSquare(100), 1);
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```
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# --seed--
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## --seed-contents--
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```js
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function iteratedSquare(n) {
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}
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```
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# --solutions--
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```js
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function iteratedSquare(n) {
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var total;
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while (n != 89 && n != 1) {
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total = 0;
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while (n > 0) {
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total += Math.pow(n % 10, 2);
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n = Math.floor(n/10);
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}
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n = total;
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}
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return n;
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}
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```
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