### Find the word definition

##### Longman Dictionary of Contemporary English
EXAMPLES FROM CORPUS
▪ 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.

##### Wiktionary

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'''

##### WordNet

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

##### Wikipedia

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.