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Encoding a string in c sharp #

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

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter a string");
            string s = Console.ReadLine(),s2="",s3="",s4="";
            string[] arr={"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
            string fstring = "", dstring = "",hstring="";
         
           
                      int i,ch;
                      for (i = 0; i < s.Length; i++)
                      {
                          ch = s[i]; s2 = ""; s4 = ""; s3 = "";
                          while (ch > 0)
                          {
                              s2 = (ch % 2) + s2;
                              ch = ch / 2;
                          }
                          s2 = "0" + s2;
                          if (s2.Length < 8)
                              s2 = "0" + s2;
                          fstring += s2 + " ";
                         
                          s3 = s2.Substring(4, 4) + s2.Substring(0, 4);
                          dstring += s3 + " ";

                          s4 += arr[Convert.ToInt32(s2.Substring(4, 4),2)] + arr[Convert.ToInt32(s2.Substring(0, 4),2)];
                          hstring += s4 + " ";


                      }


                      Console.WriteLine(fstring+"\n"+dstring+"\n"+hstring);
                     

                      Console.WriteLine();
                       
                      Console.ReadKey();
        }
    }
}
       
}
*/

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