Program to calculate area of triangle using Hero's formula

/*Aim :program to calculate area of triangle with the help of HERO's formula*/ #include<stdio.h> #include<conio.h> #include<math.h> int a,b,c; float S,A; int main() { printf("enter a,b,c\n"); scanf("%d%d%d",&a,&b,&c); S=(a+b+c)/2; A=sqrt(S*(S-a)*(S-b)*(S-c)); printf("Area is %2.2f\n",A); getch(); }