View Code of Problem 24

#include<stdio.h>
#include<math.h>
main(){
	int a,b,c;
	double m,s;
	while(scanf("%d%d%d",&a,&b,&c)!=EOF){
		m=(a+b+c)/2.0;
		s=sqrt(m*(m-a)*(m-b)*(m-c));
		printf("%.2lf\n",s);
	}
}