如何测试负零? [英] How can I test for negative zero?

问题描述

最初我认为 Math.Sign 将是正确的方法，但在运行测试后，它似乎处理 -0.0 和 +0.0 相同.

Initially I thought Math.Sign would be the proper way to go but after running a test it seems that it treats -0.0 and +0.0 the same.

推荐答案

这是一个非常糟糕的 hack 方法:

Here's a grotty hack way of doing it:

private static readonly long NegativeZeroBits =
    BitConverter.DoubleToInt64Bits(-0.0);

public static bool IsNegativeZero(double x)
{
    return BitConverter.DoubleToInt64Bits(x) == NegativeZeroBits;
}

基本上这是测试 -0.0 的确切位模式，但不必对其进行硬编码.

Basically that's testing for the exact bit pattern of -0.0, but without having to hardcode it.

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