View Code of Problem 24

#include<stdio.h>
#include<math.h>
void main(){
	int a,b,c;
	double h,cosA,s;
	while(scanf("%d%d%d",&a,&b,&c)!=EOF){
		if(a+b>c&&a+c>b&&b+c>a){
			cosA=(b*b+c*c-a*a)/(2.0*b*c);
			h=sqrt(b*b-b*cosA*b*cosA);
			s=0.5*c*h;
			printf("%.2f\n",s);
		}
		else
			printf("error!\n");
	}
}

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