1  
       2  int * foo (int *x, int b)
       3  {
       4  
       5    *(x++) = 55;
       6    if (b)
       7      *(x++) = b;
       8  
       9    return x;
      10  }
      11  
      12  main()
      13  {
      14    int a[5];
      15  
      16    memset (a, 1, sizeof (a));
      17  
      18    if (foo(a, 0) - a != 1 || a[0] != 55 || a[1] != a[4])
      19      abort();
      20  
      21    memset (a, 1, sizeof (a));
      22  
      23    if (foo(a, 2) - a != 2 || a[0] != 55 || a[1] != 2)
      24      abort();
      25  
      26    exit (0);
      27  }