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std::iswdigit - cppreference.com

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<metanoindex/>

<tbody> </tbody>

Elemento definito nell'header

<cwctype>

int iswdigit( wint_t ch );

Controlla se corrisponde il dato di caratteri estesi (se ridotto) per uno dei dieci caratteri numerici decimali 0123456789.

Original:

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

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Parametri

ch -

carattere esteso

Original:

wide character

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Valore di ritorno

Valore diverso da zero (true) se il carattere esteso è un carattere numerico, 0 (false) altrimenti.

Original:

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

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Note

iswdigit e iswxdigit sono gli unici standard di ampie funzioni di classificazione dei caratteri che non sono interessati dalla localizzazione attualmente installato C.

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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Esempio

Alcuni locali offrono classi di caratteri aggiuntivi che consentono di rilevare non-ASCII cifre

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

Vedi anche

Verifica se un carattere è classificato come una cifra da un locale

Original:

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

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(funzione di modello) [modifica]

Verifica se un carattere è una cifra

Original:

checks if a character is a digit

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(funzione) [modifica]

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