View Code of Problem 24

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