std::islower

 

C++

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Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

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Bibliothèque pour les expressions régulières (C++11)

Bibliothèque pour les opérations atomiques (C++11)

Bibliothèque pour les processus légers (threads) (C++11)

 

Bibliothèque de chaînes de caractères

Chaînes à zéro terminal Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456

Les chaînes d'octets

Chaines multi-octets

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basic_string

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Chaînes d'octets à zéro terminal

Fonctions Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
Manipulation caractère Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
isalnum isalpha islower isupper isdigit isxdigit isblank (C++11)	iscntrl isgraph isspace isprint ispunct tolower toupper
Conversion aux formats numériques Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
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strcpy
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strxfrm
Examen chaîne Original: String examination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
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memchr
memcmp
memset
memcpy
memmove
Divers Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
strerror

 

Defined in header <cctype>
int islower( int ch );

Vérifie si le caractère donné est classé comme un caractère en minuscule en fonction de la localisation en cours C. Dans la valeur par défaut "C", islower retourne true uniquement pour les lettres minuscules (abcdefghijklmnopqrstuvwxyz) .

Original:

Checks if the given character is classified as a lowercase character according to the current C locale. In the default "C" locale, islower returns true only for the lowercase letters (abcdefghijklmnopqrstuvwxyz).

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Si islower retours true, il est garanti que iscntrl, isdigit, ispunct et isspace retour false de la même nature dans la même zone C .

Original:

If islower returns true, it is guaranteed that iscntrl, isdigit, ispunct, and isspace return false for the same character in the same C locale.

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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. maria 123456

Retourne la valeur

Valeur non nulle (true) si le caractère est une lettre minuscule, 0 (false) autrement .

Original:

Non-zero value (true) if the character is a lowercase letter, 0 (false) otherwise.

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Exemple

#include <iostream>
#include <cctype>
#include <clocale>
 
int main()
{
    char c = '\xe5'; // letter å in ISO-8859-1
 
    std::cout << "islower(\'\\xe5\', default C locale) returned "
               << std::boolalpha << (bool)std::islower(c) << '\n';
 
    std::setlocale(LC_ALL, "en_GB.iso88591");
    std::cout << "islower(\'\\xe5\', ISO-8859-1 locale) returned "
              << std::boolalpha << (bool)std::islower(c) << '\n';
 
}

Résultat :

islower('\xe5', default C locale) returned false
islower('\xe5', ISO-8859-1 locale) returned true

Voir aussi

islower(std::locale)	vérifie si un caractère est considéré comme minuscules par un paramètre régional Original: checks if a character is classified as lowercase 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. maria 123456 (fonction générique)
iswlower	vérifie si un caractère large est en minuscules Original: checks if a wide character is lowercase The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456 (fonction)
C documentation for islower

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