std::fixed, std::scientific, std::hexfloat, std::defaultfloat
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| Definido no cabeçalho <ios>
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| std::ios_base& fixed( std::ios_base& str ); |
(1) | |
| std::ios_base& scientific( std::ios_base& str ); |
(2) | |
| std::ios_base& hexfloat( std::ios_base& str ); |
(3) | (desde C++11) |
| std::ios_base& defaultfloat( std::ios_base& str ); |
(4) | (desde C++11) |
Modifica a formatação padrão de ponto flutuante de I / O
1) Original:
Modifies the default formatting for floating-point I/O
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define o
2) floatfield do str fluxo para fixed como se ligando str.setf(std::ios_base::fixed, std::ios_base::floatfield)Original:
sets the
floatfield of the stream str to fixed as if by calling str.setf(std::ios_base::fixed, std::ios_base::floatfield)The text has been machine-translated via Google Translate.
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define o
3) floatfield do str fluxo para scientific como se ligando str.setf(std::ios_base::scientific, std::ios_base::floatfield)Original:
sets the
floatfield of the stream str to scientific as if by calling str.setf(std::ios_base::scientific, std::ios_base::floatfield)The text has been machine-translated via Google Translate.
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define o
4) basefield do fluxo str para fixed scientific e, simultaneamente, como se ligando str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). Isto permite a formatação de ponto flutuante hexadecimal.Original:
sets the
basefield of the stream str to fixed and scientific simultaneously as if by calling str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). This enables hexadecimal floating-point formatting.The text has been machine-translated via Google Translate.
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define o
basefield do str fluxo para zero, como se chamando str.unsetf(std::ios_base::floatfield). Isso permite que a formatação padrão de ponto flutuante, que é diferente da fixa e científicos.Original:
sets the
basefield of the stream str to zero, as if by calling str.unsetf(std::ios_base::floatfield). This enables the default floating-point formatting, which is different from fixed and scientific.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::fixed
out de std::basic_ostream tipo ou com uma indicação tal como para qualquer in >> std::scientific in de std::basic_istream tipo.Original:
This is an I/O manipulator, it may be called with an expression such as out << std::fixed for any
out of type std::basic_ostream or with an expression such as in >> std::scientific for any in of type std::basic_istream.The text has been machine-translated via Google Translate.
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Índice |
[editar] 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. |
[editar] 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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[editar] Exemplo
#include <iostream> #include <sstream> int main() { std::cout << "The number 0.01 in fixed: " << std::fixed << 0.01 << '\n' << "The number 0.01 in scientific: " << std::scientific << 0.01 << '\n' << "The number 0.01 in hexfloat: " << std::hexfloat << 0.01 << '\n' << "The number 0.01 in default: " << std::defaultfloat << 0.01 << '\n'; double f; std::istringstream("0x1P-1022") >> std::hexfloat >> f; std::cout << "Parsing 0x1P-1022 as hex gives " << f << '\n'; }
Saída:
The number 0.01 in fixed: 0.010000 The number 0.01 in scientific: 1.000000e-02 The number 0.01 in hexfloat: 0x1.47ae147ae147bp-7 The number 0.01 in default: 0.01 Parsing 0x1P-1022 as hex gives 2.22507e-308
[editar] Veja também
| mudanças de ponto flutuante de precisão Original: changes floating-point precision The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
