Chapter 6 Extra Credit in Class Assignment (Decent Numbers)

DecentNumbers.java

/*
 * Name: Tony Silvestri
 * Date: 9/11/19
 * Course Number: CSC-220
 * Course Name: Data Structures
 * Problem Number: Chapter 6 Extra Credit in Class Assignment
 * Email: silvestri@stcc.edu
 * Decent Number Calculation
 */

import java.util.Scanner;

public class DecentNumbers {
	final static String TITLE = "Decent Numbers V1.0";
	final static String CONTINUE_PROMPT = "Do this again? [y/N] ";
	final static boolean PROCESS_USING_SCANNER = true;
	
	//**********************************************
	// Put as many methods you need here
	
	
	private static String decentNumber(int digits) {
	    int maxGroupof3Fives = digits / 3;
	    while (maxGroupof3Fives >= 0) {
	        int remainingThrees = digits - 3 * maxGroupof3Fives;
	        if (remainingThrees % 5 == 0)
	            break;
	        maxGroupof3Fives--;
	    }
	    if (maxGroupof3Fives < 0)
	    	return "-1";
	    String dn = "";
	    for (int i = 0; i < maxGroupof3Fives * 3; i++)
	    	dn += "5";
	    for (int i = 0; i < digits - 3 * maxGroupof3Fives; i++)
	        dn += "3";
	    return dn;
	}	
	
	
	//**********************************************
	
	private static void process(Scanner sc, String args[]) {
		System.out.print("Enter number of digits in DN: ");
		int digits = sc.nextInt();
		String dn = decentNumber(digits);
		System.out.println("Decent Number of " + digits + " digits = " + dn);
	}


	//**********************************************
	
	@SuppressWarnings("unused")
	private static boolean doThisAgain(Scanner sc, String prompt) {
		System.out.print(prompt);
		if (PROCESS_USING_SCANNER && sc.hasNextLine())  
			sc.nextLine();     
		String doOver = sc.nextLine();
		return doOver.trim().equalsIgnoreCase("Y");
	}
	
	//**********************************************
	
	public static void main(String args[]) {
		System.out.println("Welcome to " + TITLE);
		Scanner sc = new Scanner(System.in);
		do {
			process(sc, args);
		} while (doThisAgain(sc, CONTINUE_PROMPT));
		sc.close();
		System.out.println("Thank you for using " + TITLE);
	}

}