Year.java

import java.util.Scanner;

/**
 * Luigi Battaglioli
 * Year Assignment
 */
public class Year {
    public static void main(String[] args)
    {
        // Create a new Scanner object to get user input.
        Scanner s = new Scanner(System.in);

        // Set aside some space in memory to hold the year, month, and day
        int year, month, day;

        // Parse the users input for the integers representing the year, month, and day.
        month = Integer.parseInt(s.next());
        day = Integer.parseInt(s.next());
        year = Integer.parseInt(s.next());

        // Convert the inputted date to a single long number
        long date = convertDays(year, month, day);

        // Print out that converted long date
        System.out.println("Date: " + date);

        // Check if the year is a leap year
        boolean isLeapYear = isLeapYear(year);

        // If it is a leap year, print out a message saying so
        if(isLeapYear) {
            System.out.println("This is a leap year!");
        } else {
            System.out.println("This is not a leap year.");
        }
    }

    /**
     * Converts the inputted year, month, and day to a single long number.
     *
     * @param year
     * @param month
     * @param day
     *
     * @return (long) date
     */
    private static long convertDays(int year, int month, int day)
    {
        // your long year will be the:
        // - sum of the year multiplied by 10000
        // - the month multiplied by 100
        // - and the day.

        return (year * 10000) + (month * 100) + (day);
    }

    /**
     * Checks if the year is a leap year.
     *
     * @param year
     * @return boolean
     */
    private static boolean isLeapYear(int year)
    {
        // Checks if the year is:
        // - Divisible by 400.
        // - Or, divisible by 4 and not 100.
        if(year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) {
            return true;
        }

        return false;
    }
}