View Code of Problem 24

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#define N 1000
int main()
{
    int a,b,c;
    double s;
    while(scanf("%d %d %d",&a,&b,&c)!=EOF){
    	s=sqrt((a+b+c)*(a+b-c)*(a+c-b)*(b+c-a))/4;
    	printf("%.2f", s);

    }

    return 0;
}