#include "math.h"
#define S(a,b,c) (a+b+c)/2
#define area(a,b,c) sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c)-c))
main()
{
    int a,b,c,s;
    printf("What is a?");
    scanf("%d",&a);
    printf("What is b?");
    scanf("%d",&b);
    printf("What is c?");
    scanf("%d",&c);
    s=area(a,b,c);
    printf("Area is %d",s);
    getch();
    }