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    std::isxdigit

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    Revision as of 04:15, 10 November 2013 by P12 (talk | contribs) (move ub note to the main text)
     
    C++
     
    Text processing library
     
    Null-terminated byte strings
     
    Defined in header <cctype> 
    int isxdigit( int ch );

    Checks if the given wide character is a hexadecimal numeric character (0123456789abcdefABCDEF).

    The behavior is undefined if the value of ch is not representable as unsigned char and is not equal EOF.

    Parameters

    ch - character to classify

    Return value

    Non-zero value (true) if the character is an hexadecimal numeric character, 0 (false) otherwise.

    Notes

    isdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale. although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits.

    See also

    		 checks if a character is classified as a hexadecimal digit by a locale
    (function template) [edit]
    		checks if a wide character is a hexadecimal character
    (function) [edit]
    C documentation for isxdigit
    ASCII values characters

    iscntrl
    iswcntrl

    isprint
    iswprint

    isspace
    iswspace

    isblank
    iswblank

    isgraph
    iswgraph

    ispunct
    iswpunct

    isalnum
    iswalnum

    isalpha
    iswalpha

    isupper
    iswupper

    islower
    iswlower

    isdigit
    iswdigit

    isxdigit
    iswxdigit

    decimal hexadecimal octal
    0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
    9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
    10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
    14–31 \xE–\x1F \16–\37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
    32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0
    33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
    48–57 \x30–\x39 \60–\71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0
    58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
    65–70 \x41–\x46 \101–\106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
    71–90 \x47–\x5A \107–\132 GHIJKLMNOP
    QRSTUVWXYZ     		0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
    91–96 \x5B–\x60 \133–\140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
    97–102 \x61–\x66 \141–\146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
    103–122 \x67–\x7A \147–\172 ghijklmnop
    qrstuvwxyz     		0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
    123–126 \x7B–\x7E \172–\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
    127 \x7F \177 backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0