View Code of Problem 24

#include <iostream>
#include <math.h>
using namespace std;

int main(){
  double a,b,c,p,s;
  while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF){
    p = (a+b+c)/2;
    s = sqrt(p*(p-a)*(p-b)*(p-c));
    printf("%.2lf\n",s);
  }
}