#include
int main()
{ float a,b,c,p,s;
printf("Enter 3 floats:");
scanf("%f,%f,%f",&a,&b,&c);
p=(a+b+c)/2;
s=sqrt(p*(p-a)*(p-b)*(p-c));
printf("area=%.2f\n",s);
return 0;
}
