/*  
    Author: Shawn Biddle
    Description:
     This fairly useless program converts
     up to 256 characters to and from 
     ROT13.
    Date Created: 2/8/2007 21:00
*/

#include <iostream>  //standard I/O header
#include <ctype.h>   //for tolower
#include <windows.h> //for SetConsoleTitle 
#include <conio.h>   //for getch() instead of waiting for linefeed
using namespace std;
int main(){
    char userInput[256];
    char exit;
    short i;
    do {
        system("cls");                          //Clears the screen
        SetConsoleTitle("ROT13 Translator");    //Alternate Method would be using "system("title <string>");"
        cout<<"Enter a sentance (up to 256 letters including spaces): ";
        cin.getline(userInput, 256, '\n');      //Gets user input and ends input after encountering a new line
        system("cls");
        
        cout<<"This is the original input:\n"<< userInput << endl;
        
        //This for loop is the actual "encryption"; A->M Converted to  N->Z
        for (i=0;i < sizeof(userInput);i++){
            userInput[i]=toupper(userInput[i]);
            if(int(userInput[i])>=65  && int(userInput[i])<=77){
                 userInput[i] += 13;
            }
            else if(int(userInput[i])>=78 && int(userInput[i])<=90){
                 userInput[i] -= 13;
            }
        }
        //Convert back to lowercase 
        for (i=0;i < sizeof(userInput);i++){
            userInput[i]=tolower(userInput[i]);
            }
        cout <<"\nThis is the phrase translated:\n"<<userInput<< endl;
        cout<<"\n\n\aPress Y to translate another or anything else to quit. . ."<< endl;
    } while (tolower(getch())=='y');
    system("cls");
    cout<<"Hopefully you aren't using this for evil purposes. Good Bye"<< endl;
    cout<<"Press any key to continue. . .";
    getch();
    return 0;
}