std::isalnum
De cppreference.com
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Déclaré dans l'en-tête <cctype>
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int isalnum( int ch ); |
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Vérifie si le caractère donné est un caractère alphanumérique en fonction de la localisation en cours C, c'est à dire soit un nombre (
0123456789
dans la langue par défaut), une lettre majuscule (ABCDEFGHIJKLMNOPQRSTUVWXYZ
dans la langue par défaut), ou une lettre minuscule (abcdefghijklmnopqrstuvwxyz
dans la langue par défaut) .Original:
Checks if the given character is an alphanumeric character according to the current C locale, i.e. either a number (
0123456789
in the default locale), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ
in the default locale), or a lowercase letter (abcdefghijklmnopqrstuvwxyz
in the default locale).The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Sommaire |
[modifier] Paramètres
ch | - | caractère
Original: character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifier] Retourne la valeur
Valeur non nulle (true) si le caractère est un caractère alphanumérique,
0
(false) autrement .Original:
Non-zero value (true) if the character is an alphanumeric character,
0
(false) otherwise.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[modifier] Exemple
Illustre l'utilisation de isalnum () avec différents paramètres régionaux (spécifiques à l'OS) .
Original:
Demonstrates the use of isalnum() with different locales (OS-specific).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
#include <iostream> #include <cctype> #include <clocale> int main() { const char c = '\xdf'; // German letter ß in ISO-8859-1 std::cout << "isalnum(\'\\xdf\', default C locale) returned " << std::boolalpha << (bool)std::isalnum(c) << '\n'; std::setlocale(LC_ALL, "de_DE.iso88591"); std::cout << "isalnum(\'\\xdf\', ISO-8859-1 locale) returned " << std::boolalpha << (bool)std::isalnum(c) << '\n'; }
Résultat :
isalnum('\xdf', default C locale) returned false isalnum('\xdf', ISO-8859-1 locale) returned true
[modifier] Voir aussi
vérifie si un caractère alphanumérique est classé comme par un paramètre régional Original: checks if a character is classified as alphanumeric 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. (fonction générique) | |
vérifie si un caractère large est alphanumérique Original: checks if a wide character is alphanumeric The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
C documentation for isalnum
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ASCII values (hex) |
characters |
isalnum |
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0 - 8 | 0x00-0x08
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control codes (NUL , etc.)
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
9 | 0x09
|
tab (\t )
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≠0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
10 - 13 | 0x0A-0x0D
|
whitespaces (\n ,\v ,\f ,\r )
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≠0
|
0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
14 - 31 | 0x0E-0x1F
|
control codes | ≠0
|
0
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0
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0
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0
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0
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0
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0
|
0
|
0
|
0
|
0
|
32 | 0x20
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space | 0
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≠0
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≠0
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≠0
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0
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0
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0
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0
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0
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0
|
0
|
0
|
33 - 47 | 0x21-0x2F
|
!"#$%&'()*+,-./
|
0
|
≠0
|
0
|
0
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≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
48 - 57 | 0x30-0x39
|
0123456789
|
0
|
≠0
|
0
|
0
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≠0
|
0
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≠0
|
0
|
0
|
0
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≠0
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≠0
|
58 - 64 | 0x3a-0x40
|
:;<=>?@
|
0
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≠0
|
0
|
0
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≠0
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≠0
|
0
|
0
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0
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0
|
0
|
0
|
65 - 70 | 0x41-0x46
|
ABCDEF
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0
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≠0
|
0
|
0
|
≠0
|
0
|
≠0
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≠0
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≠0
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0
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0
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≠0
|
71 - 90 | 0x47-0x5A
|
GHIJKLMNOPQRSTUVWXYZ
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0
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≠0
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0
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0
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≠0
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0
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≠0
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≠0
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≠0
|
0
|
0
|
0
|
91 - 96 | 0x5B-0x60
|
[\]^_`
|
0
|
≠0
|
0
|
0
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≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
97 -102 | 0x61-0x66
|
abcdef
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0
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≠0
|
0
|
0
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≠0
|
0
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≠0
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≠0
|
0
|
≠0
|
0
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≠0
|
103-122 | 0x67-0x7A
|
ghijklmnopqrstuvwxyz
|
0
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≠0
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0
|
0
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≠0
|
0
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≠0
|
≠0
|
0
|
≠0
|
0
|
0
|
123-126 | 0x7B-0x7E
|
{|}~
|
0
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≠0
|
0
|
0
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≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
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127 | 0x7F
|
backspace character (DEL )
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≠0
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0
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0
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0
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0
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0
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0
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0
|
0
|
0
|
0
|
0
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