public static void choice(int number, int choice) {
		if (choice > 4 || choice < 1) {
			System.out.println("Invalid Choice.");
			main(null);
			return;
		} else {
			Number n = new Number(number);
			switch (choice) {
			case 1:
				System.out.println("The units digit is " + n.getUnits());
				break;
			case 2:
				System.out.println("The tens digit is " + n.getTens());
				break;
			case 3:
				System.out.println("The hundreds digit is " + n.getHundreds());
				break;
			case 4:
				return;
			}
			main(null);
		}
	}