P. 200 Ex. 7.63

// Shavit Borisov
// CW

import java.util.Scanner;

public class SecretCode {

    public static void main(String[] args)

    {
        Scanner in = new Scanner (System.in);

        char ch;
        int length;
        boolean direction = true;

        System.out.print("Enter the length of your secret code: ");
        length = in.nextInt();

        System.out.print("Enter your secret code letter by letter and divide words with '!':");
        ch = in.next().charAt(0);

        for(int i = 0; i < length; i++)
        {
            if (ch == '!')
                direction = !direction;
            else
            {
                if(direction)
                    ch++;
                else if (!direction)
                    ch--;
            }
            System.out.printf("%c\n", ch);

            System.out.print("Enter your next letter: ");
            ch = in.next().charAt(0);
        }

        System.out.println("Goodbye!");

        in.close();
    }

}