Espaços nominais
Variantes
Acções

std::fixed, std::scientific, std::hexfloat, std::defaultfloat

Da cppreference.com
< cpp‎ | io‎ | manip

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
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Abstrações
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Entrada / saída manipuladores
De ponto flutuante de formatação
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat


(C++11)
(C++11)
Formatação inteiro
Original:
Integer formatting
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Formatação booleana
Original:
Boolean formatting
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boolalpha
noboolalpha
Largura do campo e controle de preenchimento
Original:
Field width and fill control
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Outra formatação
Original:
Other formatting
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Espaços de processamento
Original:
Whitespace processing
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Saída de descarga
Original:
Output flushing
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Sinalizadores de status manipulação
Original:
Status flags manipulation
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Tempo e dinheiro I / O
Original:
Time and money I/O
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get_money(C++11)
get_time(C++11)
put_money(C++11)
put_time(C++11)
 
Defined in header <ios>
(1)
std::ios_base& scientific( std::ios_base& str );
(2)
std::ios_base& hexfloat( std::ios_base& str );
(3) (a partir do C++ 11)
std::ios_base& defaultfloat( std::ios_base& str );
(4) (a partir do C++ 11)
Modifica a formatação padrão de ponto flutuante de I / O
Original:
Modifies the default formatting for floating-point I/O
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1)
define o 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)
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2)
define o 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)
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3)
define o 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.
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4)
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.
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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.
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Índice

[editar] Parâmetros

str -
referência ao fluxo de E / S
Original:
reference to I/O stream
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[editar] Valor de retorno

str (referência ao fluxo após a manipulação)
Original:
str (reference to the stream after manipulation)
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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';
}

Output:

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
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(função) [edit]