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std::isalpha

De cppreference.com
< cpp‎ | string‎ | byte

 
 
Strings biblioteca
Terminadas en nulo
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Null-terminated strings
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Cadenas de bytes
Multibyte cuerdas
Cadenas anchas
Clases
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Classes
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basic_string
char_traits
 
Terminadas en nulo de bytes
Funciones
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Functions
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De manipulación de caracteres
Original:
Character manipulation
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Las conversiones a formatos numéricos
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Conversions to numeric formats
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Cadena de manipulación
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String manipulation
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strcpy
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Cadena examen
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String examination
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Memoria manipulación
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Memory manipulation
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memchr
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Varios
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Miscellaneous
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strerror
 
Defined in header <cctype>
int isalpha( int ch );
Comprueba si el carácter dado es un carácter alfabético de acuerdo con el entorno nacional C instalado actualmente. En la configuración regional predeterminada, esta función devuelve true para las letras y 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.
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Contenido

[editar] Parámetros

ch -
carácter
Original:
character
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[editar] Valor de retorno

Valor distinto de cero (true) si el carácter es un carácter alfabético, 0 (false) de otra manera .
Original:
Non-zero value (true) if the character is an alphabetic character, 0 (false) otherwise.
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[editar] Ejemplo

#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';
 
}

Output:

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

[editar] Ver también

Comprueba si un carácter está clasificado como alfabético por una configuración regional
Original:
checks if a character is classified as alphabetic by a locale
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(función de plantilla) [edit]
Comprueba si un carácter ancho es alfabético
Original:
checks if a wide character is alphabetic
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(función) [edit]
C documentation for isalpha
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