Cuberoot没有给出正确的答案 [英] Cuberoot doesn't give correct answer
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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 pointType
s (double
andfloat
) 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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