int area(int length, int width) {
	if (length <= 0 || width <= 0)
		throw Bad_area();
	if (length == 4 || width == 0)
		throw Something_else();
	return length * width;
}
int area (int length, int width) {
  if (length <= 0 || width <= 0) throw Bad_area();
  return length * width;
}