1. C# / Говнокод #6099

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    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Caeser_method
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 3;
            Console.Write("Input string to encoding: ");
            string input = Console.ReadLine();
            Csr enc = new Csr(n,input);
           // Csr dec;
            enc.encrypt();
            Console.WriteLine(enc);
           // dec = new Csr(n, input);
            enc.decrypt();
            
            Console.WriteLine(enc);
            Console.ReadLine();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Caeser_method
{
    class Csr
    {
        public int n;
        public string phraze,outputphr;
        public Csr(int n, string phraze) 
        {
            this.n = n;
            this.phraze = phraze;
            this.outputphr = "";
        }

        
        public void encrypt() 
        {
            foreach (char c in this.phraze)
                if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
                {
                    if (char.IsLetter(c)) this.outputphr += (char)(char.IsUpper(c) ?
                                                                      (c + this.n > 'Z' ? ('A' + ((c -'Z'  + (this.n - 1)))) : (c + this.n)) :
                                                                      (c + this.n > 'z' ? ('a' + ((c - 'z' + (this.n - 1)))) : (c + this.n)));
                    else this.outputphr += c;
                }
                else
                {
                    if (char.IsLetter(c)) this.outputphr += (char)(char.IsUpper(c) ?
                                                                      (c + this.n > 'Я' ? ('А' + ((c - 'Я' + (this.n - 1)))) : (c + this.n)) :
                                                                      (c + this.n > 'я' ? ('а' + ((c - 'я' + (this.n - 1)))) : (c + this.n)));
                    else this.outputphr += c;
                }
        }


        public void decrypt()
        {
            this.phraze = this.outputphr;
            this.outputphr = "";
            foreach (char c in this.phraze)
                if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
                {
                    if (char.IsLetter(c)) this.outputphr += (char)(char.IsUpper(c) ?
                                                                      (c - this.n < 'A' ? ('Z' - (('A' - c + (this.n - 1)))) : (c - this.n)) :
                                                                      (c - this.n < 'a' ? ('z' - (('a' - c + (this.n - 1)))) : (c - this.n)));
                    else this.outputphr += c;
                }
                else
                {
                    if (char.IsLetter(c)) this.outputphr += (char)(char.IsUpper(c) ?
                                                                      (c - this.n < 'А' ? ('Я' - (('А' - c + (this.n - 1)))) : (c - this.n)) :
                                                                      (c - this.n < 'а' ? ('я' - (('а' - c + (this.n - 1)))) : (c - this.n)));
                    else this.outputphr += c;
                }
        }

        public override string ToString()
        {
            return string.Format("Encoded string: {0}",this.outputphr);
        }

    }
}

    Реализация шифрования методом Цезаря

    Запостил: rybaki, 27 Марта 2011

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