#include <stdio.h>

void swap(int *, int *);
void swap_ptr(int **, int **);

void main(void)
{
  int one = 11, two = 22;
  int *ptr1, *ptr2;

  ptr1 = &one;
  ptr2 = &two;

  printf("\nInitial values \n");
  printf("\nAddress of one = %x two = %x ptr1 = %x ptr2 = %x\n", &one, &two,
             &ptr1, &ptr2);
  printf("Value of one = %d two = %d ptr1 = %x ptr2 = %x\n", one, two, 
           ptr1, ptr2);
  printf("Value of *ptr1 = %d *ptr2 = %d\n", *ptr1, *ptr2);

  swap(&one, &two);
  printf("\nAfter swapping one and two\n");
  printf("\nAddress of one = %x two = %x ptr1 = %x ptr2 = %x\n", &one, &two,
             &ptr1, &ptr2);
  printf("Value of one = %d two = %d ptr1 = %x ptr2 = %x\n", one, two, 
           ptr1, ptr2);
  printf("Value of *ptr1 = %d *ptr2 = %d\n", *ptr1, *ptr2);
  swap(ptr1, ptr2);
  printf("\nAfter swapping ptr1 and ptr2\n");
  printf("\nAddress of one = %x two = %x ptr1 = %x ptr2 = %x\n", &one, &two,
             &ptr1, &ptr2);
  printf("Value of one = %d two = %d ptr1 = %x ptr2 = %x\n", one, two, 
           ptr1, ptr2);
  printf("Value of *ptr1 = %d *ptr2 = %d\n", *ptr1, *ptr2);
  swap_ptr(&ptr1, &ptr2);
  printf("\nAfter swapping &ptr1 and &ptr2\n");
  printf("\nAddress of one = %x two = %x ptr1 = %x ptr2 = %x\n", &one, &two,
             &ptr1, &ptr2);
  printf("Value of one = %d two = %d ptr1 = %x ptr2 = %x\n", one, two, 
           ptr1, ptr2);
  printf("Value of *ptr1 = %d *ptr2 = %d\n", *ptr1, *ptr2);

}

void swap(int *one, int *two)
{
  int temp = *one;

   *one = *two;
   *two = temp;
}


void swap_ptr(int **one, int **two)
{
  int *temp = *one;

   *one = *two;
   *two = temp;
}