BB\u0042 (C99)\U000042 (C99)\x42 (encoding-dependent)\102 (encoding-dependent)\u{42} (C++23)\x{42} (C++23, encoding-dependent)\o{102} (C++23, encoding-dependent)\U00000042\u0042\x42 (encoding-dependent)\102 (encoding-dependent)\u0042\u{42}\u0042\x42\42\000042=42%42