caesar cipher

public static String incode(String strIn, int delta) {
        String strOut = "";

        // bring delta to positive value
        while (delta < 0) {
            delta += 26;
        }

        for (int i = 0; i < strIn.length(); i++) {
            char c = strIn.charAt(i);

            if (Character.isAlphabetic(c)) {
                char startLetter = Character.isUpperCase(c) ? 'A' : 'a';    // convert [a, z] to [0, 25]
                strOut += (char) ((c - startLetter + delta) % 26 + startLetter);
            } else {
                strOut += c;
            }
        }

        return strOut;
    }

public static String decode(String strIn, int delta) {
        return incode(strIn, -delta);
    }function caesarCipher(str, shift) {
  const alphabetArr = "abcdefghijklmnopqrstuvwxyz".split("");
  let res = "";

  for (let i = 0; i < str.length; i++) {
    const char = str[i];
    const idx = alphabetArr.indexOf(char);

    // if it is not a letter, don`t shift it
    if (idx === -1) {
      res += char;
      continue;
    }

    // only 26 letters in alphabet, if > 26 it wraps around
    const encodedIdx = (idx + shift) % 26;
    res += alphabetArr[encodedIdx];
  }
  return res;
}def caesar_encrypt():
    word = input('Enter the plain text: ')
    c = ''
    for i in word:
        if (i == ' '):
            c += ' '
        else:
            c += (chr(ord(i) + 3))
    return c

def caesar_decrypt():
    word = input('Enter the cipher text: ')
    c = ''
    for i in word:
        if (i == ' '):
            c += ' '
        else:
            c += (chr(ord(i) - 3))
    return c
  
plain = 'hello'
cipher = caesar_encrypt(plain)
decipher = caesar_decrypt(cipher)