0xD

0xD is the hexadecimal literal representing the value 13. The prefix 0x is used in many programming languages, including C, C++, Java, JavaScript, and Python, to indicate that the following digits are in base-16. When encountered in code, 0xD is interpreted as the integer 13.

In binary, 13 is 1101. As a 4-bit nibble, its representation is 1101, and in an 8-bit byte it would be 00001101. The statement “0xD” and “13” refer to the same value, just expressed in different numeric bases.

Common uses of 0xD include serving as a numeric constant in source code, as part of larger hexadecimal values such as 0xD0 or 0x1D3, and in bitwise operations, masks, and low-level programming tasks. Hex literals are often case-insensitive, so 0xD and 0Xd denote the same value in most languages.

In ASCII and Unicode contexts, the decimal value 13 corresponds to the carriage return control character. Its hexadecimal form is 0x0D, so 0xD and 0x0D represent the same numeric value, with 0x0D being the explicit two-digit code used in character encoding and protocol specifications.

See also: hexadecimal notation, hex literals, ASCII control characters.