16.零起点学算法11——求梯形面积

Posted 2021-01-08 estwind

#include<stdio.h>
int main ()
{
     float a,b,h,s;
     while(scanf("%f,%f,%f",&a,&b,&h)!=EOF)
     {
     s=(a+b)*h/2;
     printf("%.2f",s);
     }
     return 0;
}