/* An instance of this class represents a time of day, precise to the
** minute (e.g., 7:38am).
**
** Authors: R. McCloskey and < STUDENTS' NAMES >
*/

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) {
      setTo(h,m,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() {
      if (this.minute >= 10) {   
         if (isAM) { return hour + ":" + minute + "AM"; }
         else { return hour + ":" + minute + "PM"; }
      }
      else {
         if (isAM) { return hour + ":0" + minute + "AM"; }
         else { return hour + ":0" + minute + "PM"; }      
      }
   }

   /* Returns a String describing the time of day represented by this object,
   ** in the 24-hour format (sometimes referred to as the "military" format).
   ** Such a string has the form hh:mm, where hh is a two-digit numeral
   ** (with a leading zero if necessary) indicating the number of full hours
   ** to have passed since midnight and mm is a two-digit numeral
   ** (with leading zero if necessary) indicating the number of full minutes
   ** to have passed since the beginning of the current hour.
   ** (E.g., 3:27PM is "15:27", 12:08AM is "00:08").
   */
   public String toString24Format() {
      return "";  // STUB
   }

   /* Reports whether or not this time of day falls earlier in the day
   ** than does the time of day represented by (formal parameter) t.
   */
   public boolean isEarlierThan(TimeOfDay t) {
      return false;   // 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) {
      this.hour = h;
      this.minute = m;
      this.isAM = isAM;
   }

   /* Advances this time of day by one minute (possibly rolling over into
   ** the following day).
   */
   public void goForwardByMinute() {
      minute = minute + 1;
      if (minute == 60) {
         minute = 0;
         hour = hour + 1;
         if (hour == 13) { hour = 1; }
      }
      // This method is flawed!!
   }

   /* 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 
   }

}