C ++ int浮动铸造 [英] C++ int float casting

问题描述

为什么m always = 0？ someClass的x和y成员是整数。

Why is m always = 0? The x and y members of someClass are integers.

float getSlope(someClass a, someClass b)
{           
    float m = (a.y - b.y) / (a.x - b.x);
    cout << " m = " << m << "\n";
    return m;
}

推荐答案

结果，是整数，被分配为float。如果结果小于1，那么它最终为0.

Integer division occurs, then the result, which is an integer, is assigned as a float. If the result is less than 1 then it ends up as 0.

您需要先将表达式转换为浮动，然后分割，例如

You'll want to cast the expressions to floats first before dividing, e.g.

float m = (float)(a.y - b.y) / (float)(a.x - b.x);

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