#!/usr/local/bin/tcc -run
#include<stdio.h>

struct Trapezoid
{
    int top;
    int bottom;
    int height;
    double area;
};
 double bm1(struct Trapezoid anyone);

int main (void)
{
  
    double area;
    struct Trapezoid shape1 = {4, 5, 5, 0.0};
    struct Trapezoid shape2 = {3, 4, 6, 0.0};
    
    area = bm1(shape1);
    printf("%lf\n",area);
   
    area = bm1(shape2);
    printf("%lf\n",area);
   
    return 0;
}
 double bm1(struct Trapezoid anyone)
 {
     return (anyone.top + anyone. bottom)* anyone.height/2;
}