ch4_02.cs

《c#技术内幕代码》

using System;

class CH4_2
{
   public static void Main()
   {
      // Illustrate a simple for loop that counts from 1 to 5
      for ( int i=0; i<5; ++i )
          System.Console.WriteLine( "I = {0}", i );
 
      // Illustrate two loops to first find a letter in a string
      // and then to print it out until a space is encountered.
      // This shows you how to skip initialization in the second
      // loop
      int nPos = 0;
      string s = "this is a test of the emergency broadcast system";
      
      for ( nPos = 0; nPos < s.Length; ++nPos )
         if ( s[nPos] == 'b' )
	    break;
      for ( ; nPos < s.Length; ++nPos )
      {
         if ( s[nPos] == ' ' )
	    break;
	 System.Console.Write(s[nPos]);
	 
      }
      System.Console.WriteLine("\n");
      
      // Finally, illustrate how to use the for loop for something
      // other than an integer and how to change the increment
      int state = 0;
      for ( double d = 0.0; d < 5.0; )
      {
         System.Console.WriteLine( "D = {0}", d );
	 switch ( state )
	 {
	    case 0:
	       d += 0.1;
	       break;
	    case 1:
	       d += 0.2;
	       break;
	    case 2:
	       d += 0.5;
	       break;
	 }
	 state ++;
	 if ( state > 2 )
	    state = 0;
      }
   }
}