View Code of Problem 24

#include <stdio.h>
#include <math.h>
int main(){
	double a,b,c,sum;
	double s;
	while(scanf("%lf%lf%lf",&a,&b,&c) != EOF)
	{
		sum = (a+b+c)/2;
		s = sqrt(sum*(sum-a)*(sum-b)*(sum-c));
		printf("%.2lf\n",s);
	}
	return 0;
}