BUG还是Feature？ 计算器计算(10% + 10% =？)
cn·@oflyhigh·
0.000 HBDBUG还是Feature？ 计算器计算(10% + 10% =？)
前些天看到一个消息，说是使用手机计算器，计算`10% + 10%`结果等于`0.11`，第一感觉是不信，结果调出我三星手机的计算器一算，果然是这个结果。  （使用bing.com上网页计算器算出来的结果） 然后用其它手机测试了一下，我手头有的手机，都是这样。`10% + 10%`不应该等于`0.2`吗？这个问题想必上小学的小朋友都能轻易算出，为啥计算器算出来的却是`0.11`呢？到底发生了什么事情？  （使用Google上网页计算器算出来的结果） 测试了一下，计算器计算的结果不止影响`10% + 10%`，所有和百分比有关的加减法都受影响，比如说： ***`20% + 20%`*** > ***`10% - 10%`***  ***`10 + 10%`***  找了一些文章，据说在计算器中，`%`这个功能最初源于计算小费等等，比如一段饭花费100元，加上10%的小费，那么用计算器来算就是`100+10% = 110`。 也就是说，在计算器进行运算时，自动对上述算式进行了补充，***计算`A + B%`会被补充为`A + A * B%`***。`100+10% `变成了`100+100 * 10%`所以就等于`110`啦。 感兴趣的小伙伴可以用计算器验证一下`100+100 * 10%`，看看是不是正常？ 不过，或许这个功能在国外生活场景中非常实用，但是我觉得还是该是多少就是多少比较好，按数字/数学应该的样子来。 另外一个有意思的事是，百度的计算器不存在这个问题。 > 我不确定百度的网页计算器是不是一直都这样，如果是在`10% + 10%`被广泛讨论之前就这样，那么就值得为百度点赞喽。 ---- <center><strong>Vote For Me As Witness</strong> https://steemit.com/~witnesses type in **`oflyhigh`** and click ***`VOTE`*** [](https://steemit.com/~witnesses) [Vote @oflyhigh via Steemconnect](https://steemconnect.com/sign/account-witness-vote?witness=oflyhigh&approve=1) <strong>Thank you!</strong></center>
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