Jan’s LightOJ :: 1178 - Trapezium Solution

1178 - Trapezium
Solution:

#include <stdio.h>
#include <math.h>
int main()
    {
    int T,i;
    double a,b,c,d,s,h,w,area,result;
    scanf("%d",&T);

    for(i =0; i<T; i++) {
            scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
            s = (d+b+a-c)/2;
            area = sqrt(s*(s-d)*(s-b)*(s-a+c));
                        h = (2*area)/(fabs(a-c));
                        result = ((a+c)*h)/2;
                        printf("Case %d: %lf\n",i+1,result);



            }

    return 0;


    }