/* An instance of this class represents a time of day, precise to the
** minute (e.g., 7:38am).
*/

public class TimeOfDay {

   // instance variables
   // ------------------
   boolean isAM;   // true means that the represented time is before noon
   int hour;
   int minute;
  

   // constructors
   // ------------

   /* Initializes this TimeOfDay object to represent the time of day 
   ** described by the three parameters.
   ** precondition: 1 <= h <= 12 && 0 <= m < 60
   */
   public TimeOfDay(int h, int m, boolean isAM) {
      hour = h;
      minute = m;
      this.isAM = isAM;
   }

   /* Initializes this object to represent noon.
   */
   public TimeOfDay() {
      this(12, 0, false);
   }


   // observers
   // ---------

   /* Returns a String describing the time of day represented by this object.
   ** Examples:  "7:38AM", "11:06PM"
   */
   public String toString() {
      return hour + ":" + minute + isAM;
   }

   /* Returns a String describing the time of day represented by this object,
   ** in the 24-hour format (sometimes referred to as the "military" format) 
   ** (e.g., 15:27, 9:05).
   */
   public String toString24Format() {
      return "";  // STUB
   }
   

   // mutators
   // --------

   /* Sets this time of day to that described by the three parameters.
   ** precondition: 1 <= h <= 12 && 0 <= m < 60
   */
   public void setTo(int h, int m, boolean isAM) {
      // STUB
   }

   /* Advances this time of day by one minute (possibly rolling over into
   ** the following day).
   */
   public void goForwardByMinute() {
      // STUB
   }

   /* Advances this time of day by one hour (possibly rolling over into
   ** the following day).
   */
   public void goForwardByHour() {
      // STUB
   }

   /* Backs up this time of day by one minute (possibly rolling over into
   ** the previous day).
   */
   public void goBackwardsByMinute() {
      // STUB
   }

   /* Backs up this time of day by one hour (possibly rolling over into
   ** the previous day).
   */
   public void goBackwardsByHour() {
      // STUB 
   }


   // --------------------------------------
   // main() (strictly for testing purposes)
   // --------------------------------------

   public static void main(String[] args) {
      int hr = Integer.parseInt(args[0]);
      int min = Integer.parseInt(args[1]);
      boolean isAM = args[2].charAt(0) == 'A';

      TimeOfDay tod = new TimeOfDay(hr, min, isAM);

      System.out.println("Time of day is: " + 
                         tod.toString() + " or " + tod.toString24Format());

      tod.goForwardByMinute();
      System.out.println("After going forward by a minute: " +
                         tod.toString() + " or " + tod.toString24Format());

      tod.goBackwardsByMinute();
      System.out.println("After going backwards by a minute: " + 
                         tod.toString() + " or " + tod.toString24Format());

      tod.goForwardByHour();
      System.out.println("After going forward by an hour : " + 
                         tod.toString() + " or " + tod.toString24Format());

      tod.goBackwardsByHour();
      System.out.println("After going backwards by an hour: " +
                         tod.toString() + " or " + tod.toString24Format());
   }

}