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

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Definido no cabeçalho `<string>`

`int stoi( const std::string& str, size_t *pos = 0, int base = 10 );`	(1)	(desde C++11)

`long stol( const std::string& str, size_t *pos = 0, int base = 10 );`	(2)	(desde C++11)

`long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );`	(3)	(desde C++11)

Interpreta um valor inteiro assinado na seqüência 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:

(opcional) plus or minus sign
(opcional) prefix (0) indicating octal base (applies only when the base is 8)
(opcional) 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.

O índice do primeiro caractere não convertido é armazenado em pos. Se NULL é passada como pos, é ignorado.

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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Parâmetros

str	-	a string para converter 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	-	endereço. de um inteiro para armazenar o índice do primeiro caractere não convertido 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	-	a base do número 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.

Valor de retorno

A seqüência de convertidos para o tipo assinado inteiro especificado.

Original:

The string converted to the specified signed integer type.

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Exceções

std::invalid_argument se nenhuma conversão poderia ser realizada
Original:
std::invalid_argument if no conversion could be performed
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std::out_of_range se o valor convertido iria cair para fora do intervalo do tipo de resultado.
Original:
std::out_of_range if the converted value would fall out of the range of the result type.
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Exemplo

#include <iostream>
#include <string>

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

Saída:

Veja também


atoi atol atoll	converte uma seqüência de byte para um valor inteiro 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. (função) [edit]

stoul stoull (C++11) (C++11)	converte uma string para um inteiro sem sinal 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. (função) [edit]

stof stod stold (C++11) (C++11) (C++11)	converte uma string para um valor de ponto flutuante 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. (função) [edit]

to_string (C++11)	converte um valor de ponto flutuante para integral ou `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. (função) [edit]