std::isalpha
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<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <cctype>
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int isalpha( int ch ); |
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Verifica se o caráter dado é um caractere alfabético de acordo com a localidade C instalado atualmente. Na localidade padrão, esta função retorna
true para as letras e ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz.Original:
Checks if the given character is an alphabetic character according to the currently installed C locale. In the default locale, this function returns
true for the letters ABCDEFGHIJKLMNOPQRSTUVWXYZ and abcdefghijklmnopqrstuvwxyz.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.
Parâmetros
| ch | - | personagem
Original: character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valor de retorno
Valor diferente de zero (
true) se o personagem é um caractere alfabético, 0 (false) de outra forma.Original:
Non-zero value (
true) if the character is an alphabetic 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.
Exemplo
#include <iostream>
#include <cctype>
#include <clocale>
int main()
{
char c = '\xdf'; // German letter ß in ISO-8859-1
std::cout << "isalpha(\'\\xdf\', default C locale) returned "
<< std::boolalpha << (bool)std::isalpha(c) << '\n';
std::setlocale(LC_ALL, "de_DE.iso88591");
std::cout << "isalpha(\'\\xdf\', ISO-8859-1 locale) returned "
<< std::boolalpha << (bool)std::isalpha(c) << '\n';
}
Saída:
isalpha('\xdf', default C locale) returned false
isalpha('\xdf', ISO-8859-1 locale) returned true
Veja também
checa se o caractere é classificado como alfabético pela localização Original: checks if a character is classified as alphabetic 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. (modelo de função) | |
verifica se um caractere largo é alfabética Original: checks if a wide character is alphabetic The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
Documentação C para isalpha
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| ASCII values (hex) |
characters | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 - 8 | 0x00-0x08
|
control codes (NUL, etc.)
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≠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
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| 10 - 13 | 0x0A-0x0D
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whitespaces (\n,\v,\f,\r)
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
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| 14 - 31 | 0x0E-0x1F
|
control codes | ≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 32 | 0x20
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space | ||||||||||||