ex-04-08

Programming Csharp Source Code(代码) Programming Csharp Source Code

//Example 04-08: Using in, out, and ref parameters 

public class Time
  {
     // public accessor methods
     public void DisplayCurrentTime()
     {
        System.Console.WriteLine("{0}/{1}/{2} {3}:{4}:{5}", 
           Month, Date, Year, Hour, Minute, Second);
     }

     public int GetHour()
     {
        return Hour;
     }

       public void SetTime(int hr, out int min, ref int sec)
       {
           // if the passed in time is >= 30
           // increment the minute and set second to 0
           // otherwise leave both alone
           if (sec >= 30)
           {
               Minute++;
               Second = 0;
           }
           Hour = hr; // set to value passed in

           // pass the minute and second back out
           min = Minute;
           sec = Second;
       }

     // constructor
     public Time(System.DateTime dt)
     {
        
        Year = dt.Year;
        Month = dt.Month;
        Date = dt.Day;
        Hour = dt.Hour;
        Minute = dt.Minute;
        Second = dt.Second;
     }

      // private member variables
     private int Year;
     private int Month;
     private int Date;
     private int Hour;
     private int Minute;
     private int Second;

  }

  public class Tester
  {
     static void Main()
     {
        System.DateTime currentTime = System.DateTime.Now;
        Time t = new Time(currentTime);
        t.DisplayCurrentTime();

           int theHour = 3;
           int theMinute;
           int theSecond = 20;

           t.SetTime(theHour, out theMinute, ref theSecond);
           System.Console.WriteLine(
            "the Minute is now: {0} and {1} seconds", 
               theMinute, theSecond);

           theSecond = 40;
           t.SetTime(theHour, out theMinute, ref theSecond);
           System.Console.WriteLine("the Minute is now: 
           {0} and {1} seconds", 
               theMinute, theSecond);

     }

  }