View Code of Problem 24

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