std::atoi, std::atol, std::atoll
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| Definido no cabeçalho <cstdlib>
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| int atoi( const char *str ); |
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| long atol( const char *str ) |
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| long long atoll( const char *str ); |
(desde 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.The text has been machine-translated via Google Translate.
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You can help to correct and verify the translation. Click here for instructions.
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:
The text has been machine-translated via Google Translate.
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- (opcional) mais ou de menosOriginal:(opcional) plus or minus signThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - dígitos numéricosOriginal:numeric digitsThe text has been machine-translated via Google Translate.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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'; }
Saída:
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) |
| 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) | |
| converte uma seqüência de byte para um valor inteiro sem sinal Original: converts a byte string to an unsigned 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) | |
| Documentação C para atoi, atol, atoll
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