dd\u0064 (C99)\U000064 (C99)\x64 (encoding-dependent)\144 (encoding-dependent)\u{64} (C++23)\x{64} (C++23, encoding-dependent)\o{144} (C++23, encoding-dependent)\U00000064\u0064\x64 (encoding-dependent)\144 (encoding-dependent)\u0064\u{64}\u0064\x64\64\000064=64%64