View Code of Problem 24

#include<stdio.h>
#include<math.h>
#include <string.h>
#define Max 1000
int main()
{
	
   float a,b,c,s,d;
   while(scanf("%f %f %f",&a,&b,&c))
   {
   	if(a+b>c&&a+c>b&&b+c>a)
   {
   d=(a+b+c)/2;
   s=sqrt(d*(d-a)*(d-b)*(d-c));
   printf("%.2f\n",s);
   }
   }
   
 return 0;
}