std::stoi, std::stol, std::stoll - cppreference.com

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Elemento definito nell'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:

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) [modifica]

stoul stoull (C++11) (C++11)	converte una stringa in un intero senza segno (funzione) [modifica]

stof stod stold (C++11) (C++11) (C++11)	converte una stringa in un valore a virgola mobile (funzione) [modifica]

to_string (C++11)	converte un valore intero od a virgola mobile in una `string` (funzione) [modifica]