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std::isalnum - cppreference.com

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Definido no cabeçalho

<cctype>

int isalnum( int ch );

Verifica se o caráter dado é um caractere alfanumérico de acordo com a localidade C atual, ou seja, quer um número (0123456789 no local padrão), uma letra maiúscula (ABCDEFGHIJKLMNOPQRSTUVWXYZ no local padrão), ou uma letra minúscula (abcdefghijklmnopqrstuvwxyz no local padrão).

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).

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Parâmetros

ch -

personagem

Original:

character

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Valor de retorno

Valor diferente de zero (true) se o personagem é um caractere alfanumérico, 0 (false) de outra forma.

Original:

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

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Exemplo

Demonstra o uso de isalnum () com diferentes localidades (OS-específica) .

Original:

Demonstrates the use of isalnum() with different locales (OS-specific).

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#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';

}

Saída: 

isalnum('\xdf', default C locale) returned false
isalnum('\xdf', ISO-8859-1 locale) returned true

Veja também

checa se o caractere é classificado como alfanumérico pela localização

Original:

checks if a character is classified as alphanumeric by a locale

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(modelo de função) [edit]

verifica se um caractere largo é alfanumérico

Original:

checks if a wide character is alphanumeric

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(função) [edit]

Documentação C para isalnum

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