std::fixed, std::scientific, std::hexfloat, std::defaultfloat
De cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
| Defined in header <ios>
|
||
| 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 el formato predeterminado de punto flotante de I / O
1) Original:
Modifies the default formatting for floating-point I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
establece el
2) 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)The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
establece el
3) 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)The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
establece el
4) 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Contenido |
[editar] Parámetros
| str | - | referencia a la secuencia 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 (referencia a la corriente después de la manipulación)Original:
str (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) | |
