View Code of Problem 24

#include <bits/stdc++.h>
using namespace std;

int main()
{
	float a,b,c,p;
	while(cin>>a>>b>>c) {
		p=(a+b+c)/2.0;
		printf("%.2f\n",sqrt(p*(p-a)*(p-b)*(p-c)));
	}
	return 0;
}