Namespace
Varianti

std::isdigit

Da cppreference.com.
< cpp‎ | string‎ | byte

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
Null-stringhe terminate byte
Funzioni
Original:
Functions
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Carattere manipolazione
Original:
Character manipulation
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Le conversioni in formati numerici
Original:
Conversions to numeric formats
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Della gestione delle stringhe
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String esame
Original:
String examination
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Memoria manipolazione
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varie
Original:
Miscellaneous
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strerror
 
Elemento definito nell'header <cctype>
int isdigit( int ch );
Controlla se il carattere dato è una delle 10 cifre decimali: 0123456789.
Original:
Checks if the given character is one of the 10 decimal digits: 0123456789.
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Indice

[modifica] Parametri

ch -
carattere
Original:
character
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[modifica] Valore di ritorno

Valore diverso da zero (true) se il carattere è un carattere numerico, 0 (false) altrimenti.
Original:
Non-zero value (true) if the character is a numeric character, 0 (false) otherwise.
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[modifica] Note

isdigit e isxdigit sono gli unici standard di strette funzioni di classificazione dei caratteri che non sono interessati dalla localizzazione attualmente installato C. anche se alcune implementazioni (ad esempio, Microsoft nel 1252 tabella codici) può classificare ulteriori caratteri a singolo byte come cifre.
Original:
isdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale. although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits.
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[modifica] Vedi anche

Verifica se un carattere è classificato come una cifra da un locale
Original:
checks if a character is classified as a digit by a locale
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(funzione di modello) [modifica]
Verifica se un carattere esteso è una cifra
Original:
checks if a wide character is a digit
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(funzione) [modifica]
C documentation for isdigit
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