Namespace
Varianti

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

Da cppreference.com.
< cpp‎ | io‎ | manip

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
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
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(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Ingresso / uscita manipolatori
Virgola mobile formattazione
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat


(C++11)
(C++11)
Formattazione Integer
Original:
Integer formatting
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Formattazione Boolean
Original:
Boolean formatting
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boolalpha
noboolalpha
Larghezza del campo e il controllo di riempimento
Original:
Field width and fill control
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Di formattazione
Original:
Other formatting
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Elaborazione degli spazi vuoti
Original:
Whitespace processing
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Uscita di lavaggio
Original:
Output flushing
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Flag di stato manipolazione
Original:
Status flags manipulation
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Tempo e denaro 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) (dal C++11)
std::ios_base& defaultfloat( std::ios_base& str );
(4) (dal C++11)
Modifica la formattazione predefinita per floating-point I / O
Original:
Modifies the default formatting for floating-point I/O
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1)
imposta il floatfield del str flusso di fixed come se chiamando 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)
imposta il floatfield del str flusso di scientific come se chiamando 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)
imposta il basefield del flusso str di fixed e scientific contemporaneamente come se chiamando str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). In questo modo esadecimale in virgola mobile di formattazione.
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)
imposta il basefield del str flusso a zero, come se chiamando str.unsetf(std::ios_base::floatfield). Questo permette virgola mobile formattazione predefinita, che è diverso dal fisso e scientifica.
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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Si tratta di un manipolatore di I / O, può essere chiamato con espressioni quali out << std::fixed per qualsiasi out di std::basic_ostream tipo o con un'espressione come in >> std::scientific per qualsiasi in di 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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Indice

[modifica] Parametri

str -
riferimento al flusso di I / O
Original:
reference to I/O stream
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[modifica] Valore di ritorno

str (riferimento al flusso dopo la manipolazione)
Original:
str (reference to the stream after manipulation)
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[modifica] Esempio

#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

[modifica] Vedi anche

cambiamenti in virgola mobile di precisione
Original:
changes floating-point precision
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(funzione) [edit]