View Code of Problem 24

#include<bits/stdc++.h>
using namespace std;
int main(){
	double a,b,c;
	while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF){
		double p=(a+b+c)/2;
		double s=sqrt(p*(p-a)*(p-b)*(p-c));
		printf("%.2lf\n",s);
	}
}