资料来源 : pyDict

十六进制

资料来源 : WordNet®

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

资料来源 : Free On-Line Dictionary of Computing

hexadecimal
     
         (Or "hex") {Base} 16.  A number representation
        using the digits 0-9, with their usual meaning, plus the
        letters A-F (or a-f) to represent hexadecimal digits with
        values of (decimal) 10 to 15.  The right-most digit counts
        ones, the next counts multiples of 16, then 16^2 = 256, etc.
     
        For example, hexadecimal BEAD is decimal 48813:
     
        	digit    weight        value
        	B = 11   16^3 = 4096   11*4096 = 45056
        	E = 14   16^2 =  256   14* 256 =  3584
        	A = 10   16^1 =   16   10*  16 =   160
        	D = 13   16^0 =    1   13*   1 =    13
        					 -----
        				BEAD   = 48813
     
        There are many conventions for distinguishing hexadecimal
        numbers from decimal or other bases in programs.  In {C} for
        example, the prefix "0x" is used, e.g. 0x694A11.
     
        Hexadecimal is more succinct than {binary} for representing
        {bit-masks}, machines addresses, and other low-level constants
        but it is still reasonably easy to split a hex number into
        different bit positions, e.g. the top 16 bits of a 32-bit word
        are the first four hex digits.
     
        The term was coined in the early 1960s to replace earlier
        "sexadecimal", which was too racy and amusing for stuffy
        {IBM}, and later adopted by the rest of the industry.
     
        Actually, neither term is etymologically pure.  If we take
        "binary" to be paradigmatic, the most etymologically correct
        term for base ten, for example, is "denary", which comes from
        "deni" (ten at a time, ten each), a Latin "distributive"
        number; the corresponding term for base sixteen would be
        something like "sendenary".  "Decimal" is from an ordinal
        number; the corresponding prefix for six would imply something
        like "sextidecimal".  The "sexa-" prefix is Latin but
        incorrect in this context, and "hexa-" is Greek.  The word
        {octal} is similarly incorrect; a correct form would be
        "octaval" (to go with decimal), or "octonary" (to go with
        binary).  If anyone ever implements a base three computer,
        computer scientists will be faced with the unprecedented
        dilemma of a choice between two *correct* forms; both
        "ternary" and "trinary" have a claim to this throne.
     
        [{Jargon File}]
     
        (1996-03-09)