Find the word definition

Longman Dictionary of Contemporary English
▪ For example, the following program looks at each character in a string and checks that it is a valid hexadecimal numeric character.
Douglas Harper's Etymology Dictionary

1954 (adj.); 1970 (n.); from hexa- + decimal.


a. Of a number, expressed in hexadecimal. n. (context arithmetic computing English) A number system with base 16, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, useful in computing as a hexadecimal digit can represent four bits, half a standard byte. Informal short form used in computing: '''hex'''


adj. of or pertaining to a number system having 16 as its base [syn: hex]


In mathematics and computing, hexadecimal (also base, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 09 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a, b, c, d, e, f) to represent values ten to fifteen. Hexadecimal numerals are widely used by computer system designers and programmers. Several different notations are used to represent hexadecimal constants in computing languages; the prefix "0x" is widespread due to its use in Unix and C (and related operating systems and languages). Alternatively, some authors denote hexadecimal values using a suffix or subscript. For example, one could write 0x2AF3 or 2AF3, depending on the choice of notation.

As an example, the hexadecimal number 2AF3 can be converted to an equivalent decimal representation. Observe that 2AF3 is equal to a sum of (2000 + A00 + F0 + 3), by decomposing the numeral into a series of place value terms. Converting each term to decimal, one can further write:

$$\begin{array}{rccccccccc} \mathrm{2AF3}_{16} & = & (2_{16} \times 16^3) & + & (\mathrm{A}_{16} \times 16^2) & + & (\mathrm{F}_{16} \times 16^1) & + & (3_{16} \times 16^0) \\ & = & (2 \times 4096) & + & (10 \times 256) & + & (15 \times 16) & + & (3 \times 1) \\ & = & 10995 \end{array}$$

Each hexadecimal digit represents four binary digits ( bits), and the primary use of hexadecimal notation is a human-friendly representation of binary-coded values in computing and digital electronics. One hexadecimal digit represents a nibble, which is half of an octet or byte (8 bits). For example, byte values can range from 0 to 255 (decimal), but may be more conveniently represented as two hexadecimal digits in the range 00 to FF. Hexadecimal is also commonly used to represent computer memory addresses.

Usage examples of "hexadecimal".

Now, as you see, this is basically a hexadecimal core of a multidimensional, multivariable table, in which each cylinder is given a number.

Now, as you see, this is basically a hexadecimal core of a multidimensional, multivariable table, in which each.

RIST 9E03 is the RIST that RIST 11A4 denotes by the arbitrarily chosen bit-pattern that, construed as an integer, is 9E03 (in hexadecimal notation).

Inside is a sheet of paper with a number on it, written in hexadecimal notation, which is what computer people use: 0A56 7781 6BE2 2004 89FF 9001 C782 -- and so on for about five lines.