为什么65.12 - 2在java中不等于63.12？ [英] Why is 65.12 - 2 not equal to 63.12 in java?

问题描述

可能重复：

当我遇到一个奇怪的bug时，我最近正在做一个项目。

当从65.12中减去2时，值是大于to）63.12。

下面是简化代码：
System.out.println（65.12-2）;


并在控制台输出：
63.120000000000005

我不确定为什么会出现这种情况，如果有人知道一个简单的解决方法/解决方法，那就太好了！

谢谢。

这与浮点值由计算机处理的方式有关。完全理解这个主题的建议文本是：每个计算机科学家应该做什么了解浮点运算

Possible Duplicate:
Floating point arithmetic not producing exact results in Java

I was recently working on a project when I came across a strange bug.

When 2 was subtracted from 65.12 the value was greater (not equal to) 63.12.

Here's the simplified code: System.out.println(65.12-2);

And the output in the console: 63.120000000000005

I'm not sure why this is the case and if anyone knows a simple fix/workaround that would be great!

Thanks.

解决方案

It has to do with the way floating-point values are handled by computers. The recommended text for fully understanding the topic is: What Every Computer Scientist Should Know About Floating-Point Arithmetic

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