为什么 0.1 + 0.2 结果为 0.30000000000000004

为什么 0.1 + 0.2 结果为 0.30000000000000004

为什么 0.1 + 0.2 结果为 0.30000000000000004

如果你打开浏览器的控制台,输入以下代码并运行

 > 0.1 + 0.2
 0.30000000000000004
奇怪,为什么不是 0.3。

这时可能你会去搜一下(很容易搜到结果),但是如果你了解计算机是如何存储小数(准确地说是浮点数)的话,很容易推断出原因。

我们需要有以下基础知识:

  1. 计算机将所有数据以二进制的形式存储
  2. 计算机用有限的大小来存储数据(因为现实生活中不存在无限大的内存或硬盘)
    好的,然后结合我们的问题来看。

计算机如何存储 0.1 和 0.2?

如果你对十进制转二进制有兴趣可以看下图:

如果看不懂也可以直接看结论:十进制的 0.1 转为二进制,得到一个无限循环小数:0.00011…。
也就是说,二进制无法「用有限的位数」来表示 0.1。对于 0.2 也是一样的,不赘述。二进制能「用有限的位数」表示的有:0.5、0.25、0.125 等。

但是计算机只能用有限的位数来存一个数,所以最终,计算机存的数是一个近似于 0.1 的小数。

确切的二进制值是0-01111111011-1001100110011001100110011001100110011001100110011010,
对应的十进制值是0.10000000000000000555…。

这是计算机能表示的最接近 0.1 的数字(存储一个数字的空间越大则越精确)。(具体转换过程参考这里

所以当我们计算 0.1 + 0.2 时,实际上算的是两个近似值相加,得到的值当然也是近似等于 0.3。

总结

  1. 问题的根源是十进制小数转为二进制小数的过程中,会损失精度
  2. 你在写代码的过程中,遇到小数都要小心,比如下面的代码会造成死循环
var i = 0.1
while(i!=1){
    console.log(i)
    i += 0.1
}
  1. 因为 i 加 9 次 0.1,得到的值是 1 的近似值,并不是 1。

你应该对计算机存储方式有一定的了解。

作者:方应航、方方老师 https://zhuanlan.zhihu.com/p/22328524

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