/* swap.c */
#include <stdio.h>
#include <limits.h>
void swap(int *p, int *q);

int main(void)
{
  int a,b;

  a = 1;
  b = INT_MAX;

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

  swap(&a,&b);

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

  return 0;
}

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

  tmp = *p;
  *p = *q;
  *q = tmp;
}