如何错我用Math.Pow（A，B）函数这个C＃代码？ [英] How wrong do I use Math.Pow(a,b) function in this C# code?

问题描述

我找不到什么毛病下面的代码，那里的MSVC＃编译器店NAN在C：

I can not find anything wrong with the following code, whence the MSVC# compiler stores NAN in "c":

double c = Math.Pow(-8d, 1d / 3d);

虽然我觉得这条线应该算-2C，编译器店NAN在C ？
我错了任何事？

While I think this line should calculate -2 for "c", the compiler stores NAN in "c"? Am i wrong about anything?

推荐答案

浮点数的幂函数正基地或整体只被定义指数。尝试

The power function for floating point numbers is only defined for positive base or integral exponent. Try

double c = - Math.Pow(8d, 1d / 3d);

实际上，1/3不能精确表示为浮点数，但需要圆润。为圆形指数的准确真实的结果来根本不存在的理论。

Actually, 1/3 can't be represented exactly as a floating point number, but needs to be rounded. An exact real result for the rounded exponent does not even exist in theory.

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