//***********************************************~********************

//Caesar Cipher. This program out puts a simple letter substitution

//cipher used by Julius Caesar. ROT13 replaces a letter with 13

//letters that come after in the alphabet.

//*********************************************************************

#include <fstream>

#include <iostream>

#include <string>



using namespace std;

char caesar( char );



int main()

{

   string letter;

   ofstream outData;

   ifstream inData;

   char character;



 cout << "Enter file name" << endl;

 cin >> letter;



 //open file

 inData.open (letter.c_str());

 outData.open ("note.out");



 inData >> character;

 character= toupper(character);





 while(inData)

 {

     if (character == 'A')

       {

           outData << "N";

       }





      else if (character == 'B')

       {

           outData << "O";

       }



     else if (character == 'C')

       {

           outData << "P";

       }



      else if (character == 'D')

       {

           outData << "Q";

       }



     else  if (character == 'E')

       {

           outData << "R";

       }



      else if (character == 'F')

       {

           outData << "S";

       }





      else if (character == 'G')

       {

           outData << "T";

       }





      else if (character == 'H')

       {

           outData << "U";

       }





      else if (character == 'I')

       {

           outData << "V";

       }





      else if (character == 'J')

       {

           outData << "W";

       }





    else   if (character == 'K')

       {

           outData << "X";

       }



      else if (character == 'L')

       {

           outData << "Y";

       }



     else  if (character == 'M')

       {

           outData << "Z";

       }



      else if (character == 'N')

       {

           outData << "A";

       }



     else  if (character == 'O')

       {

           outData << "B";

       }



     else  if (character == 'P')

       {

           outData << "C";

       }



      else if (character == 'Q')

       {

           outData << "D";

       }



      else if (character == 'R')

       {

           outData << "E";

       }



     else  if (character == 'S')

       {

           outData << "F";

       }



     else  if (character == 'T')

       {

           outData << "G";

       }



      else if (character == 'U')

       {

           outData << "H";

       }



     else  if (character == 'V')

       {

           outData << "I";

       }



     else  if (character == 'W')

       {

           outData << "J";

       }



     else  if (character == 'X')

       {

           outData << "K";

       }



     else  if (character == 'Y')

       {

           outData << "L";

       }



     else  if (character == 'Z')

       {

           outData << "M";

       }



       else

       {

        cout << "Incorrect input" << endl;

        }





 inData >> character;

 }







 return 0;

}