Leap year calculator.

LeapYearCalc.java

package uk.ac.qub.practicals;

// importing scanner
import java.util.Scanner;

public class LeapYearApp {
	
public final static int CURRENT_YEAR = 2013;
public final static int MINIMUM_YEAR = 1900;

/**
*
*author Niall Collins
*A Java method which gets a year of birth from a user.
*The method checks the int is within the expected range.
*The method then outputs to screen every year between that year and the current year.
*Then the program asks if the user wishes to try again.
**/
// Method for calculating leap years based on 
public static void main(String[] args) {

	// Variable declaration
	int userInput;
	int userChoice;
	userInput = 0;
	userChoice = 0;
	
	// Declaring scanner
	Scanner scanner = new Scanner(System.in);
	
	// Quitting check
	boolean invalidEntry = false;
		
	// Loop to allow the user the play again
	do {
	// Loop to prevent the user proceeding with an invalid number
		do {
		System.out.printf("Please enter the year you were born (%s to %s):
		+", MINIMUM_YEAR, CURRENT_YEAR);
		userInput = scanner.nextInt();
		} while ((userInput < MINIMUM_YEAR) || (userInput > CURRENT_YEAR));
			
		// for loop printing to screen the given year to the current year
		for (int loop = userInput; loop <= CURRENT_YEAR; loop++){
				if (loop % 4 == 0){
				System.out.println(+loop+" (leap year)");
				}else {
					System.out.println(+loop+"");
				}
		}
			
		// Checking if user wishes to quit or play again. Looping for unrecognised numbers
		do {
               		System.out.println("\nWould you like to play again?\n0. No\n1. Yes\n");
			userChoice = scanner.nextInt();

			if ((userChoice == 1) || (userChoice == 0)){
				invalidEntry = false;
			} else {
				System.out.println("Sorry, invalid entry.");
				invalidEntry = true;
			}
		} while (invalidEntry);
		
		// Checking if the user wishes to quit
	} while ((userChoice != 0));
	System.out.println("Program exiting...");
	System.exit(0);
	scanner.close();
  }
	
}