Calculate G.C.D of any two numbers

Write a program to calculate G.C.D of any two numbers.

SOLUTION:

 /*
 * Calculate G.C.D of any two numbers
 * Written by Shaeed Khan. 
 * Date: 05 Aug 2014
 * Version- 1.0 
 * Language: C
 */

#include < stdio.h >    
#include < stdlib.h >

void main()
{
 int n1,n2,x;
 printf("Enter two numbers:");
 scanf("%d%d",&n1,&n2);
 x=gcd(n1,n2);
 printf("%d ",x);
}

int gcd(int n1,int n2)
{
 while(n1!=n2)
 {
  if(n1>n2)
   n1=n1-n2;
  else
   n2=n2-n1;
 }
 return n1;
}