ch4_09.cs

《c#技术内幕代码》

using System;

class CH4_9
{
   public static void Main(String[] args)
   {
      // How to break out of a for loop, 2 ways.
      Console.WriteLine("Loop 1:");
      for ( int i=0; i<5; ++i )
      {
         if ( i == 3 )
	    break;
	 Console.WriteLine("I = {0}", i );
      }
      
      Boolean done = false;
      Console.WriteLine("Loop 2:");
      for ( int i=0; i<5 && done == false; ++i )
      {
         if ( i == 2 )
	    done = true;
	 Console.WriteLine("I = {0}", i );
      }
      
      // Another method using a goto
      done = false;
      int counter = 0;
      Console.WriteLine("Loop 3:");
      do 
      {
         if ( counter == 5 )
	    goto handle_done;
	 Console.WriteLine( "Counter: {0}", counter );
	 counter ++;
	 goto not_done;
	 
handle_done:
         done = true;
not_done:
        Console.WriteLine("End of Loop 3");

      } while ( !done );

      Console.WriteLine("Loop 4:");      
      for ( int i=0; i<5; ++i )
      {
         if ( i == 2 )
	   i = 5;
	 Console.WriteLine("I = {0}", i );
      }
   }
}