Encode or decode a message

   
/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Encode or decode a message. 
 
using System; 
  
public class Cipher { 
  public static int Main(string[] args) {   
 
    // see if arguments a present 
    if(args.Length < 2) { 
      Console.WriteLine("Usage: encode/decode word1 [word2...wordN]"); 
      return 1; // return failure code 
    } 
 
    // if args present, first arg must be encode or decode 
    if(args[0] != "encode" & args[0] != "decode") { 
      Console.WriteLine("First arg must be encode or decode."); 
      return 1; // return failure code 
    } 
 
    // encode or decode message 
    for(int n=1; n < args.Length; n++) { 
      for(int i=0; i < args[n].Length; i++) { 
        if(args[0]=="encode") 
          Console.Write((char) (args[n][i] + 1) ); 
        else  
          Console.Write((char) (args[n][i] - 1) ); 
      } 
      Console.Write(" "); 
    } 
 
    Console.WriteLine(); 
 
    return 0; 
  } 
}

1.	Get char type: control, digit, letter, number, punctuation, surrogate, symbol and white space
2.	Determining If A Character Is Within A Specified Range
3.	Is a char in a range: Case Insensitive
4.	Is a char in a range Exclusively
5.	Using Char
6.	Escape Characters
7.	A stack class for characters
8.	Demonstrate several Char methods
9.	Demonstrate the ICharQ interface: A character queue interface
10.	A set class for characters
11.	A queue class for characters
12.	IsDigit, IsLetter, IsWhiteSpace, IsLetterOrDigit, IsPunctuation
13.	Char: Get Unicode Category
14.	Char.IsLowSurrogate(), IsHighSurrogate(), IsSurrogatePair() method
15.	demonstrates IsSymbol.
16.	Buffer for characters
17.	Test an input character if it is contained in a character list.
18.	Is vowel char
19.	Filter letter and digit
20.	First Char Upper

Encode or decode a message : Char « Data Types « C# / C Sharp

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