920202-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

static int rule_text_needs_stack_pop = 0;
static int input_stack_pos = 1;

f (void)
{
  rule_text_needs_stack_pop = 1;

  if (input_stack_pos <= 0)
    return 1;
  else
    return 0;
}

main ()
{
  f ();
  exit (0);
}