Espaços nominais
Variantes
Acções

std::atoi, std::atol, std::atoll

Da cppreference.com
< cpp‎ | string‎ | byte

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
Original:
Classes
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basic_string
char_traits
 
Cordas de terminação nula de bytes
Funções
Original:
Functions
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Manipulação personagem
Original:
Character manipulation
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Conversões para formatos numéricos
Original:
Conversions to numeric formats
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atof
atoi
atol
atoll
strtol
strtoll
Manipulação de cadeia
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Exame String
Original:
String examination
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Manipulação de memória
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Diversos
Original:
Miscellaneous
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strerror
 
Defined in header <cstdlib>
int       atoi( const char *str );
long      atol( const char *str )
long long atoll( const char *str );
(a partir do C++ 11)
Interpreta um valor inteiro em uma seqüência de bytes apontado por str.
Original:
Interprets an integer value in a byte string pointed to by str.
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Função descarta quaisquer caracteres em branco até de caráter não-branco primeira é encontrada. Em seguida, ele toma como caracteres possível para formar uma representação número inteiro válido e os converte em valor inteiro. O valor válido inteiro consiste nas seguintes partes:
Original:
Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid integer number representation and converts them to integer value. The valid integer value consists of the following parts:
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  • (opcional) mais ou de menos
    Original:
    (opcional) plus or minus sign
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  • dígitos numéricos
    Original:
    numeric digits
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Índice

[editar] Parâmetros

str -
ponteiro para o byte string terminada em nulo para ser interpretado
Original:
pointer to the null-terminated byte string to be interpreted
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[editar] Valor de retorno

Valor inteiro correspondente ao conteúdo do str em caso de sucesso. Se o valor convertido cai fora do alcance do tipo de retorno correspondente, o valor de retorno é indefinido. Se nenhuma conversão pode ser executada, é devolvido 0.
Original:
Integer value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, the return value is undefined. If no conversion can be performed, 0 is returned.
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[editar] Exemplo

#include <iostream>
#include <cstdlib>
 
int main()
{
    const char *str1 = "42";
    const char *str2 = "3.14159";
    const char *str3 = "31337 with words";
    const char *str4 = "words and 2";
 
    int num1 = std::atoi(str1);
    int num2 = std::atoi(str2);
    int num3 = std::atoi(str3);
    int num4 = std::atoi(str4);
 
    std::cout << "std::atoi(\"" << str1 << "\") is " << num1 << '\n';
    std::cout << "std::atoi(\"" << str2 << "\") is " << num2 << '\n';
    std::cout << "std::atoi(\"" << str3 << "\") is " << num3 << '\n';
    std::cout << "std::atoi(\"" << str4 << "\") is " << num4 << '\n';
}

Output:

std::atoi("42") is 42
std::atoi("3.14159") is 3
std::atoi("31337 with words") is 31337
std::atoi("words and 2") is 0

[editar] Veja também

(C++11)
(C++11)
(C++11)
converte uma string para um inteiro assinado
Original:
converts a string to an signed integer
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(função) [edit]
converte uma seqüência de byte para um valor inteiro
Original:
converts a byte string to an integer value
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(função) [edit]
converte uma seqüência de byte para um valor inteiro sem sinal
Original:
converts a byte string to an unsigned integer value
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(função) [edit]
C documentation for atoi, atol, atoll