C program to reverse a number

#include <stdio.h>

int main()

{    

   int n=321,reverse=0;  

   printf("before reverse = %d\n",n);

   while(n!=0){        

        reverse = reverse*10 + n%10;        

        n=n/10;    

   }

   printf("after reverse = %d",reverse);    

   return 0;

} 

a) before reverse = 321

     After reverse = 123

b)before reverse = 321

     After reverse = 120

c)before reverse = 129

     After reverse = 321

d)before reverse = 321

     After reverse = 125