/*
 * Copyright (c) 2004 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 3nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose,
 * including teaching and use in open-source projects.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book, 
 * please visit http://www.davidflanagan.com/javaexamples3.
 */
import java.io.*;  // We're doing input, so import I/O classes

/**
 * This program reads lines of text from the user, encodes them using the 
 * trivial "Rot13" substitution cipher, and then prints out the encoded lines.
 **/
public class Rot13Input {
	public Rot13Input(){}

    public static void main(String[] args) throws IOException {
    } 
    
    /**
     * This method performs the Rot13 substitution cipher.  It "rotates"
     * each letter 13 places through the alphabet.  Since the Latin alphabet
     * has 26 letters, this method both encodes and decodes.
     **/
    public char rot13(char c) {
		if ((c >= 'A') && (c <= 'Z')) {  // For uppercase letters
            c += 13;                       // Rotate forward 13
            if (c > 'Z') 
				c -= 26;          // And subtract 26 if necessary
        }
        if ((c >= 'a') && (c <= 'z')) {  // Do the same for lowercase letters
            c += 13;
            if (c > 'z')
				c -= 26;
        }
		return c;
    }
}