View Code of Problem 24

#include <iostream>
#include <cmath>
using namespace std;
int main(){
	double a,b,c;
	while(cin>>a>>b>>c){
		double p,s;
		p=(a+b+c)/2;
		s=sqrt(p*(p-a)*(p-b)*(p-c));
		printf("%.2lf\n",s);
	}
	
	return 0;
}