#include <stdio.h>

void swap (int *first, int *second)
{
  int temp = *first;
  *first = *second;
  *second = temp;
}


int main ()
{
  int i = 5, j = 6;

  printf ("i=%d j=%d\n", i, j);

  // Pass the addresses to i and j.
  swap (&i, &j);

  printf ("i=%d j=%d\n", i, j);
}