C Program using function to find the GCD of 2 nos recursively

Write a function to find the GCD of 2 nos recursively. Also write the main()
function to use it.

#include
#include
int gcd(int a,int b);
void main()
{
int r,g,a,b;
clrscr();
printf("Enter two numbers:");
scanf("%d %d",&a,&b);
g=gcd(a,b);
printf("GCD : %d",g);
getch();
}
int gcd (int a,int b)
{
if(b>a)
return gcd(b,a);
if(b==0)
return a;

else
return gcd(b,a%b);
}

/* Output
Enter two numbers:2
4
GCD : 2
*/