/** Calendar.java - include helpful static methods dealing with calendars.
 *  We include a main method to test the functions.
 */
public class Calendar
{
  public static boolean isLeapYear(int y)
  {
    // YOU NEED TO IMPLEMENT
    return true;
  }

  // Return the # of days in the month.
  public static int monthLength(int month, int year)
  {
    // YOU NEED TO IMPLEMENT
    return 0;
  }

  // The Julian day is the number of days since 12/31 of the previous year.
  // For example, the Julian day of February 1 is 32.
  public static int julian(int month, int day, int year)
  {
    // YOU NEED TO IMPLEMENT
    return 0;
  }

  public static String zodiac(int month, int day)
  {
    // YOU NEED TO IMPLEMENT
    return "error";
  }

  public static void main(String [] args)
  {
    System.out.printf("Test of isLeapYear():\n");
    System.out.printf("1900 was a leap year - %s\n",
                      isLeapYear(1900) ? "true" : "false");
    System.out.printf("2000 was a leap year - %s\n",
                      isLeapYear(2000) ? "true" : "false");
    System.out.printf("2004 was a leap year - %s\n",
                      isLeapYear(2004) ? "true" : "false");
    System.out.printf("2005 was a leap year - %s\n",
                      isLeapYear(2005) ? "true" : "false");

    System.out.printf("\nTest of monthLength():\n");
    for (int month = 1; month <= 12; ++month)
      System.out.printf("%02d/2016 has %d days.  %02d/2019 had %d days.\n",
                        month, monthLength(month, 2016),
                        month, monthLength(month, 2019));

    System.out.printf("\nTest of julian():\n");
    for (int month = 1; month <= 12; ++month)
      System.out.printf("%02d/1/2016 --> %3d   %02d/1/2019 --> %3d\n",
                        month, julian(month, 1, 2016),
                        month, julian(month, 1, 2019));

    System.out.printf("\nTest of zodiac():\n");
    for (int month = 1; month <= 12; ++month)
      System.out.printf("%d/%d has the sign %s\n", month, 1,
                        zodiac(month, 1));
  }
}