Espacios de nombres
Variantes
Acciones

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

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< cpp‎ | io‎ | manip

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
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
Cadena de I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Entrada / salida manipuladores
De punto flotante de formato
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat


(C++11)
(C++11)
Formato Integer
Original:
Integer formatting
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Formato booleano
Original:
Boolean formatting
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boolalpha
noboolalpha
Ancho de campo y de control de llenado
Original:
Field width and fill control
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Otros formatos
Original:
Other formatting
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Los espacios en blanco de procesamiento
Original:
Whitespace processing
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Salida de lavado
Original:
Output flushing
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Indicadores de estado manipulación
Original:
Status flags manipulation
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Tiempo y dinero 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) (desde C++11)
std::ios_base& defaultfloat( std::ios_base& str );
(4) (desde C++11)
Modifica el formato predeterminado de punto flotante de I / O
Original:
Modifies the default formatting for floating-point I/O
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1)
establece el floatfield del str corriente a fixed como si se aplicase 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)
establece el floatfield del str corriente a scientific como si se aplicase 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)
establece el basefield de la corriente str a fixed scientific y al mismo tiempo como si se aplicase str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). Esto permite hexadecimal de punto flotante de formato .
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)
establece el basefield del str corriente a cero, como si se aplicase str.unsetf(std::ios_base::floatfield). Esto permite que el defecto de formato de coma flotante, que es diferente de fijo y científica .
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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Este es un manipulador de E / S, puede ser llamada con una expresión como out << std::fixed para cualquier out de std::basic_ostream tipo o con una expresión como in >> std::scientific para cualquier 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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Contenido

[editar] Parámetros

str -
referencia a la secuencia de E / S
Original:
reference to I/O stream
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[editar] Valor de retorno

str (referencia a la corriente después de la manipulación)
Original:
str (reference to the stream after manipulation)
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[editar] Ejemplo

#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] Ver también

cambios de punto flotante de precisión
Original:
changes floating-point precision
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(función) [edit]