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=(a+b+c)/2;
		double s=sqrt(p*(p-a)*(p-b)*(p-c));
		printf("%.2lf\n",s);
	}
 
}