DingDong.java

package uk.ac.qub.programming1p1;

// Importing scanner for user input
import java.util.Scanner;

public class DingDongNumberPractical {

	// Declaring constants which limit user input and control output
	public static final int MIN_INPUT = 50;
	public static final int MAX_INPUT = 100;
	public static final int DING_NUMBER = 7;
	public static final int DONG_NUMBER = 5;
	
	/**
	 * Niall Collins - 40002617
	 * A method that prompts the user for an input from 50-100 and then counts down from that
	 * input to the number 1. Editing multiples of 7 and 5 to Ding and Dong respectively.
	 * Multiples both are converted to DingDong.
	 * Method is looped to allow for multiple plays.
	 * @param args
	 */
	public static void main(String[] args) {
		// Declaring Variables
		int userInput;
		int playAgain;
		userInput = 0;
		playAgain = 0;
		
		// Creating Scanner called scanner
		Scanner scanner = new Scanner(System.in);
		
		// Boolean play again check
		Boolean invalidInput = false;
		
		// Do..while loop to allow multiple plays
		do {
			// Prompting the user for a numerical input and preventing entries outside specified range
			do {
				System.out.printf("Please input a number between %s and %s: \n",MIN_INPUT,MAX_INPUT);
				userInput = scanner.nextInt();
				// Ensuring number is within expected field
			} while ((userInput < MIN_INPUT) || (userInput > MAX_INPUT));

			// Creating a for loop to decrement userInput to 1
			for (int counter = userInput; counter >= 1; counter--){
				
				// Instructing the program how to deal with pertinent multiples
				if ((counter % DING_NUMBER == 0) && (counter % DONG_NUMBER ==0)){
					System.out.println("DingDong");	
				} else if (counter % DING_NUMBER == 0){
					System.out.println("Ding");
				} else if (counter% DONG_NUMBER == 0){
					System.out.println("Dong");
				} else System.out.println(+counter);

			}// End of for loop

			// Checking if the user wishes to play again (looped to prevent invalid entries)
			do {
				System.out.println("\nWould you like to play again?\n1. Yes\t2. No");
				playAgain = scanner.nextInt();

				if ((playAgain == 1) || (playAgain ==2)){
					invalidInput = false;
				} else {
					System.out.println("Sorry, input invalid!");
					invalidInput = true;}
			} while (invalidInput);
		
		// Closing do..while loop which allows the program to close only when the user selects 2
		} while ((playAgain != 2));
		System.out.println("Goodbye - program terminated");
		System.exit(0);
		// Closing scanner
		scanner.close();
	}// end of method

}// end of class