std::iswdigit

 

C++

Linguaggio

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Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Stringhe libreria

Null-stringhe terminate Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Byte stringhe

Multibyte stringhe

Stringhe larghe

Classi Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

Stringhe larghe null-terminated

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Carattere manipolazione Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
iswalnum iswalpha iswlower iswupper iswdigit iswxdigit iswblank (C++11) wctype iswctype	iswcntrl iswgraph iswspace iswprint iswpunct towlower towupper wctrans towctrans
Le conversioni in formati numerici Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
wcstol wcstoll wcstoul wcstoull	wcstof wcstod wcstold
Della gestione delle stringhe Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
wcslen wcscpy wcsncpy wcscat wcsncat wcscmp wcscoll wcsncmp	wcsxfrm wcschr wcsrchr wcspbrk wcsspn wcscspn wcsstr wcstok
Matrice manipolazione Original: Array manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset

 

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 3wchar_t u3 = L'三';// the CJK numeral 3wchar_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

isdigit(std::locale)	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
isdigit	Verifica se un carattere è una cifra Original: checks if a character is a digit The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
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