In
mathematics and
computer science, hexadecimal,
base-, or simply hex, is a
numeral system with a
radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. Its primary purpose is to represent the
binary code in a format easier for humans to read, and acts as a form of
shorthand, in which one hexadecimal digit stands in place of four binary
bits. For example, the
decimal numeral 79, whose
binary representation is 01001111, is 4F in hexadecimal (4 = 0100, F = 1111).
IBM introduced the current hexadecimal system to the computing world; an earlier version, using the digits 0–9 and u–z, had been introduced in 1956, and had been used by the
Bendix G-15 computer.
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