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

 

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

 

std::basic_string

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

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

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

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

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

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

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

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

basic_string::npos

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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

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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Parametri

str	-	la stringa da convertire Original: the string to convert The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
base	-	la base numerica Original: the number base 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

La stringa convertito nel tipo specificato con segno.

Original:

The string converted to the specified signed integer type.

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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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Esempio

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

Output:

45

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)
stoul stoull (C++11) (C++11)	converte una stringa in un numero intero senza segno Original: converts a string to an unsigned integer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
stof stod stold (C++11) (C++11) (C++11)	converte una stringa in un valore in virgola mobile Original: converts a string to an floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
to_string (C++11)	converte un valore in virgola mobile a integrale o string Original: converts an integral or floating point value to string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)