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Python之有意思的【0.55+0.3】

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3.57 k
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百度已收录
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Python进阶
本文最后更新于2019-05-09，已超过 1年没有更新，如果文章内容、图片或者下载资源失效，请留言反馈，我会及时处理，谢谢！

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温馨提示：本文共417个字，读完预计2分钟。


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浮点数可能让你有点眩晕，这是因为，与【整数运算结果永远精确】的特点不同，计算机里浮点数的运算是不精确的，会有四舍五入的误差。这什么意思呢？

下面，请你先心算一道题【0.55+0.3】

然后我们再让Python算一下：

Python之有意思的【0.55+0.3】-Mr.Li's Blog

哎？为什么不是【0.85】，而尾巴多了一个【1】呢？这是因为，Python计算浮点数时，会先把0.55和0.3转化成二进制数【注：二进制数由0和1表示，逢二进一】，如下：

# 进制转换
0.55(十进制) = 0.1000110011001100110011001100110011001100110011001101(二进制)
0.3(十进制) = 0.0100110011001100110011001100110011001100110011001101(二进制)

而在这个转化过程中存在误差，这样，就造成了我们与程序计算结果的差异。

所以，这俩二进制数通过二进制法则运算后，再通过复杂的计算公式，将二进制结果转成十进制小数。



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原文链接：，转发请注明来源！

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作者 : Mr.Li
别总盯着眼前的困惑，读万卷书行万里路，你会发现眼前的事，都是小事。

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