View Code of Problem 24

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

	return 0;
}