// Zorah Fung, CSE 142
// Prompts a user for a message and a "key" and encrypts the message using
// a Caesar cipher and the key as the shift value.
import java.util.*;

public class CaesarCipher {
   public static void main(String[] args) {
      Scanner console = new Scanner(System.in);
      
      System.out.print("Your secret message: ");
      String message = console.nextLine();
      message = message.toLowerCase();
      
      System.out.print("Your secret key: ");
      int key = console.nextInt();

      System.out.print("Your encoded message is: ");
      encode(message, key);
   }
   
   // Encodes the given message using the key as the shift value
   public static void encode(String message, int key) {
      for (int i = 0; i < message.length(); i++) {
         char c = message.charAt(i);
         if (c == ' ') {
            System.out.print(" ");
         } else {
            System.out.print((char) (c + key));
         }
      }
      System.out.println();
   }
   
   // We can also write a decode method, which shifts each letter back
   // to its original letter, just by using subtraction!
   public static void decode(String message, int key) {
      for (int i = 0; i < message.length(); i++) {
         char c = message.charAt(i);
         if (c == ' ') {
            System.out.print(" ");
         } else {
            System.out.print((char) (c - key));
         }
      }
      System.out.println();
   }
}