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

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< cpp‎ | io‎ | manip

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Eingang / Ausgang Manipulatoren
Gleitkomma-Formatierung
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat


(C++11)
(C++11)
Integer-Formatierung
Original:
Integer formatting
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Boolean Formatierung
Original:
Boolean formatting
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boolalpha
noboolalpha
Feldbreite und fill Kontrolle
Original:
Field width and fill control
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Andere Formatierungen
Original:
Other formatting
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Whitespace-Verarbeitung
Original:
Whitespace processing
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Output Spülung
Original:
Output flushing
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Statusflags Manipulation
Original:
Status flags manipulation
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Zeit und Geld 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) (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)
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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)
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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.
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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.
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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.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

str -
Verweisen auf I / O-Strom
Original:
reference to I/O stream
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[Bearbeiten] Rückgabewert

str (Verweis auf den Stream nach Manipulation)
Original:
str (reference to the stream after manipulation)
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[Bearbeiten] 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

[Bearbeiten] Siehe auch

Veränderungen Floating-Point Präzision
Original:
changes floating-point precision
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(Funktion) [edit]