/*

   Read in a string
   Convert all alphabetic characters by shifting by 3
      D->A
      A->X
      N->K


*/


#include <iostream>
#include <string>

using namespace std;

int main() {

                     //          11111
                     //012345678901234
     string plainText{"DAN WAS HERE 2!"};
     string codeText;

     int i;

     i = 0;
     while (i < plainText.size()){
        if ('A' == plainText[i]) {
            codeText = codeText + "X" ;
        } else if ('B' == plainText[i]) {
            codeText = codeText + "Y" ;
        } else if ('C' == plainText[i]) {
            codeText = codeText + "Z" ;
        } else  if(isalpha(plainText[i])) {
            codeText = codeText + char( int(plainText[i]) - 3) ;
        } else {
            codeText = codeText + plainText[i];
        }
        i++;
     }

     cout << "The Plain Text is  " << plainText << endl;
     cout << "The Cypher Text is " << codeText << endl;

     return 0;
}