std::strtol, std::strtoll

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari (C++11)

Operazioni atomicche (C++11)

Multithreading (C++11)

 

Stringhe libreria

Null-stringhe terminate 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.

Byte stringhe

Multibyte stringhe

Stringhe larghe

Classi Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

Null-stringhe terminate byte

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Carattere manipolazione 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.
isalnum isalpha islower isupper isdigit isxdigit isblank (C++11)	iscntrl isgraph isspace isprint ispunct tolower toupper
Le conversioni in formati numerici 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.
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
Della gestione delle stringhe Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strcpy
strncpy
strcat
strncat
strxfrm
String esame 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.
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
Memoria manipolazione Original: Memory manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
memchr
memcmp
memset
memcpy
memmove
Varie Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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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Parametri

str	-	puntatore alla stringa con terminazione null byte da interpretare Original: pointer to the null-terminated byte string to be interpreted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
str_end	-	puntatore a un puntatore a carattere . Original: pointer to a pointer to character. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
base	-	Base del valore intero interpretato Original: base of the interpreted integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Vedi anche

atoi atol atoll	converte una stringa di byte in un valore intero Original: converts a byte string to an integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
strtoul strtoull	converte una stringa di byte in un valore intero senza segno Original: converts a byte string to an unsigned integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
C documentation for strtol, strtoll