C语言 宏定义练习之三角形面积&

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<math.h>

#define S_(x,y,z) (x+y+z)/2

#define area(S,a,b,c) sqrt(S*(S-a)*(S-b)*(S-c))

    int main()

    {

            double a, b, c, s;

            scanf_s("%lf %lf %lf", &a, &b, &c);

            s = S_(a, b, c);

            printf("%.3lf", area(s, a, b, c));

            return 0;

    }