The prefix 0x is used in C, which would denote this value as 0x4F79. In programming, several notations denote hexadecimal numbers, usually involving a prefix. For example, the decimal value 20,345 would be expressed in hexadecimal as 4F79 16. In mathematics, a subscript is typically used to specify the base.
For example, an 8-bit byte can have values ranging from 00000000 to 11111111 in binary form, which can be conveniently represented as 00 to FF in hexadecimal. Each hexadecimal digit represents four bits (binary digits), also known as a nibble (or nybble).
Software developers and system designers widely use hexadecimal numbers because they provide a human-friendly representation of binary-coded values. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9, and "A"–"F" (or alternatively "a"–"f") to represent values from ten to fifteen. In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen.
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