/* Compare to ptr4.c. Why doesn't this version work? */

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

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

int main(void)
{
  int x[1] = { 3 };
  int y[1] = { 11 };

  printf("%d %d\n",x[0],y[0]);
  swap(x[0],y[0]);
  printf("%d %d\n",x[0],y[0]);
  return 0;
}