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std::iswdigit – cppreference.com

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definiert in Header

<cwctype>

int iswdigit( wint_t ch );

Prüft, ob die gegebenen-Zeichen entspricht (wenn verengt) zu einem der zehn Dezimalziffer Zeichen 0123456789 .

Original:

Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789.

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Parameter

ch -

Wide-Character

Original:

wide character

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Rückgabewert

Nicht-Null-Wert (true), wenn die breite Zeichen ein numerisches Zeichen ist, 0 (false) ansonsten .

Original:

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

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Notes

iswdigit und iswxdigit sind die einzigen Standard-Zeichen Klassifizierung Funktionen, die nicht von der aktuell installierten C locale betroffen sind .

Original:

iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.

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Beispiel

Einige Schauplätze bieten zusätzliche Charakter-Klassen, die Nicht-ASCII-Zeichen zu erkennen

Original:

Some locales offer additional character classes that detect non-ASCII digits

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#include <iostream>
#include <cwctype>
#include <clocale>
void test(wchar_t a3, wchar_t u3, wchar_t j3)
{
    std::wcout << std::boolalpha
               << "          '" << a3 << "'   '" << u3 << "'  '" << j3  << "'\n"
               << "iswdigit "
               << (bool)std::iswdigit(a3) << "  "
               << (bool)std::iswdigit(u3) << " "
               << (bool)std::iswdigit(j3) << '\n'
               << "jdigit:  "
               << (bool)std::iswctype(a3, std::wctype("jdigit")) << ' '
               << (bool)std::iswctype(u3, std::wctype("jdigit")) << ' '
               << (bool)std::iswctype(j3, std::wctype("jdigit")) << '\n';
}
int main()
{
    wchar_t a3 = L'3';  // the ASCII digit 3
    wchar_t u3 = L'三'; // the CJK numeral 3
    wchar_t j3 = L'３'; // the fullwidth digit 3

    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout << "In american locale:\n";
    test(a3, u3, j3);

    std::wcout << "\nIn japanese locale:\n";
    std::setlocale(LC_ALL, "ja_JP.utf8");
    test(a3, u3, j3);
}

Output: 

In american locale:
          '3'   '三'  '３'
iswdigit true  false false
jdigit:  false false false

In japanese locale:
          '3'   '三'  '３'
iswdigit true  false false
jdigit:  false false true

Siehe auch

prüft, ob ein Zeichen als einer Ziffer von einem locale eingestuft

Original:

checks if a character is classified as a digit by a locale

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(Funktions-Template) [edit]

prüft, ob ein Zeichen eine Ziffer ist

Original:

checks if a character is a digit

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(Funktion) [edit]

C documentation for iswdigit

ASCII values
(hex) 		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

0 - 8 0x00-0x08 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 0x09 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10 - 13 0x0A-0x0D whitespaces (\n,\v,\f,\r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
14 - 31 0x0E-0x1F control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
32 0x20 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0
33 - 47 0x21-0x2F !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
48 - 57 0x30-0x39 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0
58 - 64 0x3a-0x40 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
65 - 70 0x41-0x46 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
71 - 90 0x47-0x5A GHIJKLMNOPQRSTUVWXYZ 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
91 - 96 0x5B-0x60 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
97 -102 0x61-0x66 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
103-122 0x67-0x7A ghijklmnopqrstuvwxyz 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
123-126 0x7B-0x7E {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 0x7F backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0