如何解决这个bug？ [英] How to solve this bug?

问题描述

有谁知道如何在2013年的vb.net中解决以下问题？

Hi,

Does anyone know how to solve the following in vb.net 2013 ?

Dim x1 As Double = -0.3
Dim x2 As Double = 0.7
Dim xx As Double = x1 ^ x2 '=-1.#IND
xx = Math.Pow(x1, x2)      '=-1.#IND
xx = -0.3 ^ 0.7            '= -0.43051162024993422
xx = Math.Pow(-0.3, 0.7)   '=-1.#IND

谢谢

Thanks

推荐答案

如果你看一下Math.Pow [ ^ ]它说：

If you look at the definition of Math.Pow[^] it says:

x < 0 but not NegativeInfinity; y is not an integer, NegativeInfinity, or PositiveInfinity.
Returns NaN

请尝试：

So try:

xx = Math.Sign(x1) * Math.Pow(Math.Abs(x1), x2)

没有错误。 ^ 运算符不用于执行指数运算。该运营商是独家运营商。请参阅文档：

^运算符 [ ^ ]

There is no bug. The ^ operator is not for performing exponent operations. This operator is an exclusive-or operator. Please see the documentation:
^ Operator[^]

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