View Code of Problem 24

#include <stdio.h>
#include <math.h>

double area(int a,int b,int c)
{
    double ar,p = (a + b + c) / 2.0;
    ar= p * (p - a) * (p - b) * (p - c);
    return sqrt(ar);
}

int main(void)
{
    int a,b,c;
    while(scanf("%d%d%d",&a,&b,&c) != EOF)
    {
        printf("%.2lf\n",area(a,b,c));
    }
    return 0;
}