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Varianti

std::strtol, std::strtoll

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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atof
atoi
atol
atoll
strtol
strtoll
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
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varie
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Miscellaneous
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strerror
 
Defined in header <cstdlib>
long      strtol( const char *str, char **str_end, int base );
long long strtoll( const char *str, char **str_end, int base );
(dal C++11)
Interpreta un valore intero in una stringa di byte puntato da str.
Original:
Interprets an integer value in a byte string pointed to by str.
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Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

  • (opzionale) plus or minus sign
  • (opzionale) prefix (0) indicating octal base (applies only when the base is 8)
  • (opzionale) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
  • a sequence of digits

The set of valid digits for base-2 integer is 01, for base-3 integer is 012, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

Le funzioni imposta il puntatore puntato da str_end per puntare al carattere dopo l'ultimo carattere interpretato. Se str_end è NULL, viene ignorato.
Original:
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is NULL, it is ignored.
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Se il str è vuoto o non ha la forma prevista, la conversione non viene eseguita, e (se non è str_end NULL) il valore di str è memorizzato nell'oggetto puntato da str_end.
Original:
If the str is empty or does not have the expected form, no conversion is performed, and (if str_end is not NULL) the value of str is stored in the object pointed to by str_end.
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Indice

[modifica] Parametri

str -
puntatore alla stringa con terminazione null byte da interpretare
Original:
pointer to the null-terminated byte string to be interpreted
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str_end -
puntatore a un puntatore a carattere .
Original:
pointer to a pointer to character.
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base -
Base del valore intero interpretato
Original:
base of the interpreted integer value
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[modifica] Valore di ritorno

  • In caso di successo, un valore intero corrispondente al contenuto di str viene restituito.
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • Se il valore convertito cade fuori dalla portata del tipo di ritorno corrispondente, si verifica un errore di campo (impostazione [[cpp/error/errno|errno]] a ERANGE) e LONG_MAX, LONG_MIN, LLONG_MAX o LLONG_MIN viene restituito.
    Original:
    If the converted value falls out of range of corresponding return type, a range error occurs (setting [[cpp/error/errno|errno]] to ERANGE) and LONG_MAX, LONG_MIN, LLONG_MAX or LLONG_MIN is returned.
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  • Se la conversione non può essere eseguita, viene restituito 0.
    Original:
    If no conversion can be performed, 0 is returned.
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[modifica] Esempio

[modifica] Vedi anche

converte una stringa di byte in un valore intero
Original:
converts a byte string to an integer value
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(funzione) [edit]
converte una stringa di byte in un valore intero senza segno
Original:
converts a byte string to an unsigned integer value
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(funzione) [edit]
C documentation for strtol, strtoll