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package Crypto;

import java.util.Scanner;

public class CaesarsCipher {

public static void main(String[] args) {

int type=0;

System.out.println("Program to Perform Caesar\'s Cipher Algorithm\n---");

Scanner sm = new Scanner(System.in);

System.out.println("Enter the word. (Do not use Spaces or Special Characters): ");

String input = sm.nextLine();

System.out.println("Enter 0 for Encode or 1 for Decode.");

type= sm.nextInt();

if (type<0 || type>1) {

System.out.println("Invalid Operator!");

end();

}

System.out.println("Output: "+caesarCipher(input, type));

end();

}

private static String caesarCipher(String input, int type) {

int value = 0;

String output = "";

if (type==0) {

for(int i = 0; i<input.length(); i++) {

value = input.charAt(i);

value +=3;

output +=Character.toString ((char) value);

}

}

else {

for(int i = 0; i<input.length(); i++) {

value = input.charAt(i);

value -=3;

output +=Character.toString ((char) value);

}

}

return output;

}

private static void end() {

System.out.println("---\nThe Program has ended");

System.exit(0);

}

}