#include<math.h>
int main()
{
double a,b,c,s,area;
scanf("%lf%lf%lf",&a,&b,&c);
//a=11113.67;
//b=11115.43;
//c=11116.21;
s=(a+b+c)/2;
area=sqrt(s(s-a)(s-b)*(s-c));
printf("a=%g,b=%g,c=%g\n",a,b,c);
printf("area=%g\n\n",area);
return 0;
}
原文：https://blog.51cto.com/14502155/2430438