std::fixed, std::scientific, std::hexfloat, std::defaultfloat
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<metanoindex/>
<tbody> </tbody>| definiert in Header <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) | (seit C++11) |
std::ios_base& defaultfloat( std::ios_base& str ); |
(4) | (seit C++11) |
Ändert die Standard-Formatierung für Floating-Point-I / O
Original:
Modifies the default formatting for floating-point I/O
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1)
setzt die
floatfield des Baches str um fixed, als ob durch den Aufruf 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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2)
setzt die
floatfield des Baches str um scientific, als ob durch den Aufruf 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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3)
setzt die
basefield des Baches str um fixed und scientific gleichzeitig, als ob durch den Aufruf str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). Dies ermöglicht hexadezimale Gleitkomma-Formatierung .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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4)
setzt die
basefield des Baches str auf Null, als ob durch den Aufruf str.unsetf(std::ios_base::floatfield). Dadurch kann der Standardwert Gleitkommazahl Formatierung, die sich von festen und wissenschaftlichen ist .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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Dies ist ein I / O-Manipulators, kann es mit einem Expressionsvektor wie
out << std::fixed für jede out vom Typ std::basic_ostream oder mit einem Expressionsvektor wie in >> std::scientific für jede in vom Typ std::basic_istream aufgerufen werden .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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Parameter
| str | - | Verweisen auf I / O-Strom
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. |
Rückgabewert
str (Verweis auf den Stream nach Manipulation)Original:
str (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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Beispiel
#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
Siehe auch
Veränderungen Floating-Point Präzision 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. (Funktion) | |
