Varianti

std::strtol, std::strtoll

Da cppreference.com.

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Stringhe libreria
Null-stringhe terminate
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Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
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Classes
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basic_string
char_traits
 
Null-stringhe terminate byte
Funzioni
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Functions
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Carattere manipolazione
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Character manipulation
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Le conversioni in formati numerici
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Conversions to numeric formats
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Della gestione delle stringhe
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String esame
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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
 
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Elemento definito nell'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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