/* Check some operations with null are defined as expected. */

int main(void) {
  char c;
  char *p = 0;
  char *q = &c;

  if (p == q) return 0;
  if (p - p > 0) return 0;
  p = p + 0;
  p = 0 + p;
  p = p - 0;

  return (p == 0);
}