什么时候float变量不等于其自身 [英] When is a float variable not equal to itself

问题描述

在编程测试中有人问我这个问题.问题是，我以浮点数作为参数传递，并询问以下代码何时为假.

I was asked this questino on a programming test. The question was, I was passed in a float as a parameter, and asked when would the following code be false.

bool result  = (floatValue == floatValue);

我想不出一个正当的理由或什么时候会是假的而仍然不会的情况.最后，我回答说永远不会出现错误的情况.想知道是否有人可以给我一些例子，什么时候这是错误的

I couldn't think of a valid reason or a situation of when this would be false and still can't. In the end, I answered that there will never be a case when this would be false. Was wondering if anyone can give me some example(s) of when this would be false

推荐答案

floatValue == NaN

floatValue == NaN

如果floatValue是非数字的计算结果，例如0/0.

If floatValue is the result of a computation that is Not a Number, like 0/0.

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