Cuberoot没有给出正确的答案 [英] Cuberoot doesn't give correct answer

问题描述

你好！

我用了这个:

Hello!

I used this:

double secondnum = Math.Pow(num, 1.0 / 3);
            if (secondnum - (int)secondnum == 0)
            {
                return true;
            }
            else return false;

但是，如果我用此numb:66430125进行检查，则它给出404.99999999999989，而在计算器中给出405.那么我该如何解决这个问题?

But, if I check it with this numb:66430125 then it gives 404.99999999999989, and in calculator it gives 405. So How could I solve this one?

推荐答案

浮点Type s( double 和 float )不正确.您必须进行一些舍入，例如:

Floating point Types (double and float) are not exact. You have to do some rounding, for example:

double secondNum = Math.Round(Math.Pow(num, 1.0 / 3), 9);

哈哈.这是正确的答案，具有预期的准确性.

Ha-ha. This is a correct answer with expected accuracy.

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