//******************************************************************
// Time.java               Author: Torben Hoffmann
//                         Extended by Anne Haxthausen 25/9-2001
//
// Representation of the time.
//******************************************************************

public class Time
{
   // instance data
   private int hours, min;        // since midnight
   
   // constructor
   public
   Time(int hours, int min)
      { 
         // using this to distinguish instance data from
         // the formal parameters
         this.hours = hours; this.min = min;
         
      }

   // returns hours since midnight
   public int gethours() { return hours ;}

   // returns minutes (over hours) since midnight
   public int getmin() { return min; }

   // aux method to aid pretty printing of the time, eg,
   // 09.03 instead of 9.3
   private static 
   String twodigits(int n)
      { 
         // first the tens and then the ones
         return Integer.toString(n/10) + Integer.toString(n%10); 
      }

   public 
   String toString()
      { 
         return twodigits(hours) + "." + twodigits(min); 
      }

   // s.passtime(min) moves the current time s min minutes forward
   void passtime(int min)
      { 
         int totalMin = 60 * this.hours + this.min + min;
         this.hours = (totalMin/60)%24;
         this.min   = totalMin%60;
      }

   // returns a new Time object min minutes into the future
   public
   Time plus(int min)
      {
         int totalMin = 60 * this.hours + this.min + min;
         return new Time((totalMin/60)%24, totalMin%60);
      }

   // s.to(s) returns the number of minutes from s to t
   public
   int to(Time t)
      {  return 60 * t.hours + t.min - 60 * this.hours - this.min; 
      }

   // s.before(t) returns true if s is earlier in the day than t
   public
   boolean before(Time t)
      { return (this.hours<t.hours) 
           || (this.hours == t.hours && this.min <= t.min); 
      }
}