fifi\u0066\u0069 (C99)\U000066\U000069 (C99)\x66\x69 (encoding-dependent)\146\151 (encoding-dependent)\u{66}\u{69} (C++23)\x{66}\x{69} (C++23, encoding-dependent)\o{146}\o{151} (C++23, encoding-dependent)\U00000066\U00000069\u0066\u0069\x66\x69 (encoding-dependent)\146\151 (encoding-dependent)\u0066\u0069\u{66}\u{69}\u0066\u0069\x66\x69\66\69\000066\000069=66=69%66%69