std::dec, std::hex, std::oct
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<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <ios>
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std::ios_base& dec( std::ios_base& str ); |
(1) | |
std::ios_base& hex( std::ios_base& str ); |
(2) | |
std::ios_base& oct( std::ios_base& str ); |
(3) | |
Modifica a base padrão numérico para o inteiro I / O
Original:
Modifies the default numeric base for integer I/O
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1)
define o
basefield do str fluxo para dec como se ligando str.setf(std::ios_base::dec, std::ios_base::basefield)Original:
sets the
basefield of the stream str to dec as if by calling str.setf(std::ios_base::dec, std::ios_base::basefield)The text has been machine-translated via Google Translate.
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2)
define o
basefield do str fluxo para hex como se ligando str.setf(std::ios_base::hex, std::ios_base::basefield)Original:
sets the
basefield of the stream str to hex as if by calling str.setf(std::ios_base::hex, std::ios_base::basefield)The text has been machine-translated via Google Translate.
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3)
define o
basefield do str fluxo para oct como se ligando str.setf(std::ios_base::oct, std::ios_base::basefield)Original:
sets the
basefield of the stream str to oct as if by calling str.setf(std::ios_base::oct, std::ios_base::basefield)The text has been machine-translated via Google Translate.
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Trata-se de um manipulador de I / O, que pode ser chamada com uma indicação tal como para qualquer
out << std::hex out de std::basic_ostream tipo ou com uma indicação tal como para qualquer in >> std::hex in de std::basic_istream tipo.Original:
This is an I/O manipulator, it may be called with an expression such as
out << std::hex for any out of type std::basic_ostream or with an expression such as in >> std::hex for any in of type std::basic_istream.The text has been machine-translated via Google Translate.
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Parâmetros
| str | - | referência ao fluxo de E / S
Original: reference to I/O stream 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
str (referência ao fluxo após a manipulação)Original:
str (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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Exemplo
#include <iostream>
#include <sstream>
int main()
{
std::cout << "The number 42 in octal: " << std::oct << 42 << '\n'
<< "The number 42 in decimal: " << std::dec << 42 << '\n'
<< "The number 42 in hex: " << std::hex << 42 << '\n';
int n;
std::istringstream("2A") >> std::hex >> n;
std::cout << std::dec << "Parsing \"2A\" as hex gives " << n << '\n';
}
Saída:
The number 42 in octal: 52
The number 42 in decimal: 42
The number 42 in hex: 2a
Parsing "2A" as hex gives 42
Veja também
muda a base utilizada para o inteiro I / O Original: changes the base used for integer I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
controla se o prefixo é usado para indicar base numérica Original: controls whether prefix is used to indicate numeric base The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) |