为什么double.NaN不等于自己？ [英] Why is double.NaN not equal to itself?

问题描述

有人可以解释这样对我？在C＃double.NaN不等于double.NaN

Can someone explain this to me? In C# double.NaN is not equal to double.NaN

bool huh = double.NaN == double.NaN; // huh = false
bool huh2 = double.NaN >= 0; // huh2 = false
bool huh3 = double.NaN <= 0; // huh3 = false

我可以比作double.NaN什么恒定的，并得到真正的？

What constant can I compare to a double.NaN and get true?

推荐答案

如果你是好奇，这就是 Double.IsNaN 是这样的：

If you are curious, this is what Double.IsNaN looks like:

public static bool IsNaN(double d)
{
    return (d != d);
}

时髦的，是吧？

Funky, huh?

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