区分零和负零C ++ [英] Distinguish zero and negative zero C++

问题描述

我遇到了一个情况在我的代码中，一个函数返回一个双精度，这是可能的双精度零，负零，或另一个值完全。我需要区分零和负零，但是默认的双重比较没有。由于double的格式，C ++不允许使用逐位运算符比较双精度，所以我不确定如何处理。如何区分两者？

I have run into a situation in my code where a function returns a double, and it is possible for this double to be a zero, a negative zero, or another value entirely. I need to distinguish between zero and negative zero, but the default double comparison does not. Due to the format of doubles, C++ does not allow for comparison of doubles using bitwise operators, so I am unsure how to procede. How can I distinguish between the two?

推荐答案

致电 std :: signbit（） 确定符号位的状态。

Call std::signbit() to determine the state of the sign bit.

这篇关于区分零和负零C ++的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！