0xA4

0xA4 is a hexadecimal literal used in programming and digital systems to represent a specific byte value. The prefix 0x denotes base-16 notation, and A4 corresponds to the decimal value 164. In binary, 0xA4 is 10100100.

In character encodings such as ISO/IEC 8859-1 (Latin-1) and Windows-1252, the byte value 0xA4 maps to the currency sign ¤ (Unicode code point U+00A4). In ASCII, this byte is outside the standard 0–127 range and has no assigned character. In Unicode terminology, the character is U+00A4, commonly used to represent a generic currency symbol in some contexts.

In programming, 0xA4 is often used as a constant for specific byte patterns, flags, or data values. In languages that support hexadecimal literals (such as C, C++, Java, JavaScript, Python), 0xA4 evaluates to 164. It can be used in expressions, bitwise operations, and when constructing binary data or manipulating individual bits within a byte.

The wider context of 0xA4 lies within hexadecimal notation, a base-16 numbering system widely adopted in computing for its compact representation of binary data. Hex literals like 0xA4 are a common tool for developers dealing with low-level data, character encodings, and interfacing with hardware or protocols. See also hexadecimal notation, the 0x prefix, and Unicode code point U+00A4.