/* A program to perform Euclid's
Algorithm to compute gcd. */
int gcd(int u,int v)
{  
   if (v==0) 
	return u;
   else 
  	return gcd(u,v);
  /* u-u/v*v==u mod v */
}
void main(void)
{ 
   int x; 
   int y;
   x = 1; 
   y = 2;
   gcd(x,y);
}