View Code of Problem 24

#include<stdio.h>
#include<string.h>
#include<math.h>

int main(){

	double a,b,c,sum;
	while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF){
	double q=(a+b+c)/2;
	sum=sqrt(q*(q-a)*(q-b)*(q-c));
	printf("%.2lf\n",sum);
	}

}