/*  ex6-218-4.c  */

#include <stdio.h>

void swap(int *p, int *q);

main()
{
  int a = 5, b = 25;

  swap(&a, &b);
  printf("Now a = %d, b = %d \n", a,b);

  return 0;
}

/* Your function here */
void swap(int *p, int *q)