Namespace
Varianti

std::stoi, std::stol, std::stoll

Da cppreference.com.
< cpp‎ | string‎ | basic string

 
 
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
 
std::basic_string
Membri funzioni
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elemento accesso
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteratori
Original:
Iterators
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basic_string::begin
basic_string::cbegin

(C++11)
basic_string::end
basic_string::cend

(C++11)
basic_string::rbegin
basic_string::crbegin

(C++11)
basic_string::rend
basic_string::crend

(C++11)
Capacità
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operazioni
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Cerca
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Costanti
Original:
Constants
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basic_string::npos
Non membri funzioni
Original:
Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper classi
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
Defined in header <string>
int       stoi( const std::string& str, size_t *pos = 0, int base = 10 );
(1) (dal C++11)
long      stol( const std::string& str, size_t *pos = 0, int base = 10 );
(2) (dal C++11)
long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );
(3) (dal C++11)
Interpreta un valore intero con segno nella stringa str.
Original:
Interprets a signed integer value in the string 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.

L'indice del primo carattere non convertito viene memorizzato in pos. Se NULL viene passato come pos, viene ignorato.
Original:
The index of the first unconverted character is stored in pos. If NULL is passed as pos, it is ignored.
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Indice

[modifica] Parametri

str -
la stringa da convertire
Original:
the string to convert
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pos -
indirizzo di un numero intero per archiviare l'indice del primo carattere non convertito
Original:
address of an integer to store the index of the first unconverted character
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base -
la base numerica
Original:
the number base
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[modifica] Valore di ritorno

La stringa convertito nel tipo specificato con segno.
Original:
The string converted to the specified signed integer type.
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[modifica] Eccezioni

  • std::invalid_argument se la conversione non può essere eseguita
    Original:
    std::invalid_argument if no conversion could be performed
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  • std::out_of_range se il valore convertito cadere fuori del campo del tipo di risultato.
    Original:
    std::out_of_range if the converted value would fall out of the range of the result type.
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[modifica] Esempio

#include <iostream>
#include <string>
 
int main()
{
    std::string test = "45";
    int myint = stoi(test);
    std::cout << myint << '\n';
}

Output:

45

[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]
(C++11)
(C++11)
converte una stringa in un numero intero senza segno
Original:
converts a string to an unsigned integer
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(funzione) [edit]
(C++11)
(C++11)
(C++11)
converte una stringa in un valore in virgola mobile
Original:
converts a string to an floating point value
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(funzione) [edit]
(C++11)
converte un valore in virgola mobile a integrale o string
Original:
converts an integral or floating point value to string
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(funzione) [edit]