IIII\u0049\u0049 (C99)\U000049\U000049 (C99)\x49\x49 (encoding-dependent)\111\111 (encoding-dependent)\u{49}\u{49} (C++23)\x{49}\x{49} (C++23, encoding-dependent)\o{111}\o{111} (C++23, encoding-dependent)\U00000049\U00000049\u0049\u0049\x49\x49 (encoding-dependent)\111\111 (encoding-dependent)\u0049\u0049\u{49}\u{49}\u0049\u0049\x49\x49\49\49\000049\000049=49=49%49%49