View Code of Problem 24

#include<stdio.h>
#include<math.h>
int main(){
	double a,b,c,p,area;
	while(scanf("%lf %lf %lf",&a,&b,&c)!=EOF){
	p=(a+b+c)/2.0;
	if(a>0&&b>0&&c>0&&a+b>c&&a+c>b&&b+c>a){
	area=sqrt(p*(p-a)*(p-b)*(p-c));
	printf("%lf\n",area);
    }
}
    return 0;
}