Method ceaserCipherDecryption

Programs/CeaserCipher.java:68–102

()

    public static void ceaserCipherDecryption() {
        Scanner textInput = new Scanner(System.in);
        System.out.print("Encrypted Text: ");
        String textToEncrypt = textInput.nextLine();
        System.out.print("shifting key: ");
        int keyToUse = textInput.nextInt();
        String cipher = "";
        for (int i = 0; true; i++) {
            if (keyToUse > 50 && keyToUse <= 0) {
                System.out.print("Please Enter key value <= 50: ");
                keyToUse = textInput.nextInt();
            } else {
                for (int j = 0; j < textToEncrypt.length(); j++) {
                    char temp = textToEncrypt.charAt(j);
                    if (temp >= 'A' && temp <= 'Z') {
                        temp = (char) (temp - keyToUse);
                        if (temp < 'A') { // go back to A in Ascii
                            temp = (char) (temp - 'A' + 'Z' + 1);

                        }
                        cipher += temp;
                    } else if (temp >= 'a' && temp <= 'z') {
                        temp = (char) (temp - keyToUse);
                        if (temp < 'a') { // go back to a in Ascii
                            temp = (char) (temp - 'a' + 'z' + 1);
                        }
                        cipher += temp;
                    } else
                        cipher += temp;
                }
            }
            System.out.println("Decrypted text is: " + cipher);
            break;
        }
    }

}