View Code of Problem 24

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