std::isalnum
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<tbody> </tbody>| Dclar dans l'en-tte <cctype>
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int isalnum( int ch ); |
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Vrifie si le caractre donn est un caractre alphanumrique en fonction de la localisation en cours C, c'est dire soit un nombre (
0123456789 dans la langue par dfaut), une lettre majuscule (ABCDEFGHIJKLMNOPQRSTUVWXYZ dans la langue par dfaut), ou une lettre minuscule (abcdefghijklmnopqrstuvwxyz dans la langue par dfaut) .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.
Paramtres
| ch | - | caractre
Original: character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Retourne la valeur
Valeur non nulle (
true) si le caractre est un caractre alphanumrique, 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.
Exemple
Illustre l'utilisation de isalnum () avec diffrents paramtres rgionaux (spcifiques 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 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';
}
Rsultat :
isalnum('\xdf', default C locale) returned false
isalnum('\xdf', ISO-8859-1 locale) returned true
Voir aussi
vrifie si un caractre alphanumrique est class comme par un paramtre rgional 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 gnrique) | |
vrifie si un caractre large est alphanumrique 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
| |
| ASCII values (hex) |
characters | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
|