View Code of Problem 24

#include <stdio.h>
#include <math.h>
int main(){
	int a,b,c,sum;
	float s;
	while(scanf("%d%d%d",&a,&b,&c) != EOF)
	{
		//if(a + b < c)
			//printf("输入不正确!");
		//else if(a + c < b)
			//printf("输入不正确!");
		//else if(c + b < a)
			//printf("输入不正确!");
		sum = (a + b + c)/2;
		s = sqrt(sum * (sum - a) * (sum - b) * (sum - c));
		printf("%.2lf\n",s);
	}
	return 0;
}