// Fig. 9.1: Time1.cs
// Time1 class declaration maintains the time in 24-hour format.
public class Time1
{
   private int hour; // 0 - 23
   private int minute; // 0 - 59
   private int second; // 0 - 59

   // set a new time value using universal time; ensure that 
   // the data remains consistent by setting invalid values to zero
   public void SetTime( int h, int m, int s )
   {
      hour = ( ( h >= 0 && h < 24 ) ? h : 0 ); // validate hour
      minute = ( ( m >= 0 && m < 60 ) ? m : 0 ); // validate minute
      second = ( ( s >= 0 && s < 60 ) ? s : 0 ); // validate second
   } // end method SetTime

   // convert to string in universal-time format (HH:MM:SS)
   public string ToUniversalString()
   {
      return string.Format( "{0:D2}:{1:D2}:{2:D2}", 
         hour, minute, second );
   } // end method ToUniversalString

   // convert to string in standard-time format (H:MM:SS AM or PM)
   public override string ToString()
   {
      return string.Format( "{0}:{1:D2}:{2:D2} {3}",
         ( ( hour == 0 || hour == 12 ) ? 12 : hour % 12 ),
         minute, second, ( hour < 12 ? "AM" : "PM" ) );
   } // end method ToString
} // end class Time1

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