View Code of Problem 24

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