Java ((4-2)/4) = 0.0 不是 0.5 转换为 double 后

Question

此方法的 myNumSides 等于 4，myNumSides 是用户输入的。在将 myAngle 转换为 double 后，它仍然返回 0.0 而不是 0.5。这是为什么？

public double getMyAngle()
    {
        int n;
        n = myNumSides;

        double myAngle = (double) ((n - 2) / n);

        return myAngle;
    }

输出

Please enter number of sides => 4
Please enter length of each side => 100

Your polygon has 4 sides.
Each side of your polygon has a length of 100.0.
The angle of each vertex is 0.0.

Answer 1

为了获得正确答案，您必须执行以下操作:

double myAngle = ((n - 2.0) / n);

或

double myAngle =  ((n - 2) / (double)n);