Namespaces are additive : NameSpace : Language Basics C# Source Code

    

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Namespaces are additive. 
 
using System; 
 
// Bring Counter into view. 
using Counter; 
 
// Here is one Counter namespace. 
namespace Counter { 
  // A simple countdown counter. 
  class CountDown { 
    int val; 
 
    public CountDown(int n) { 
      val = n; 
    } 
 
    public void reset(int n) { 
      val = n; 
    } 
 
    public int count() { 
      if(val > 0) return val--; 
      else return 0; 
    } 
  } 
} 
 
// Here is another Counter namespace. 
namespace Counter { 
  // A simple count-up counter. 
  class CountUp { 
    int val; 
    int target; 
 
    public int Target { 
      get{ 
        return target; 
      } 
    } 
 
    public CountUp(int n) { 
      target = n; 
      val = 0; 
    } 
 
    public void reset(int n) { 
      target = n; 
      val = 0; 
    } 
 
    public int count() { 
      if(val < target) return val++; 
      else return target; 
    } 
  } 
} 
 
public class NSDemo5 { 
  public static void Main() { 
    CountDown cd = new CountDown(10); 
    CountUp cu = new CountUp(8); 
    int i; 
 
    do { 
      i = cd.count(); 
      Console.Write(i + " "); 
    } while(i > 0); 
    Console.WriteLine(); 
 
    do { 
      i = cu.count(); 
      Console.Write(i + " "); 
    } while(i < cu.Target); 
 
  } 
}