如何在Python中计算平方根? [英] How do I calculate square root in Python?

问题描述

为什么Python会给出错误"的答案?

Why does Python give the "wrong" answer?

x = 16

sqrt = x**(.5)
returns 4

sqrt = x**(1/2)
returns 1

是的，我知道import math并使用sqrt.但我正在寻找上述答案.

Yes, I know import math and use sqrt. But I'm looking for an answer to the above.

推荐答案

sqrt=x**(1/2)正在做整数除法. 1/2 == 0.

sqrt=x**(1/2) is doing integer division. 1/2 == 0.

因此，您在第一个实例中计算x ^(1/2)，在第二个实例中计算x ⁽⁰⁾.

So you're computing x^(1/2) in the first instance, x⁽⁰⁾ in the second.

所以没错，这是对其他问题的正确答案.

So it's not wrong, it's the right answer to a different question.

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