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

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari (C++11)

Operazioni atomicche (C++11)

Multithreading (C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

Ingresso / uscita manipolatori

Virgola mobile formattazione Original: 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.
showpoint noshowpoint setprecision	fixed scientific hexfloat defaultfloat (C++11) (C++11)
Formattazione Integer Original: Integer formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setbase showbase noshowbase	dec hex oct
Formattazione Boolean Original: Boolean formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
boolalpha noboolalpha
Larghezza del campo e il controllo di riempimento Original: Field width and fill control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setfill setw	internal left right
Di formattazione Original: Other formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpos noshowpos	uppercase nouppercase
Elaborazione degli spazi vuoti Original: Whitespace processing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ws ends	skipws noskipws
Uscita di lavaggio Original: Output flushing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
flush endl	unitbuf nounitbuf
Flag di stato manipolazione Original: Status flags manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
resetiosflags	setiosflags
Tempo e denaro I / O Original: Time and money I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)

 

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)	(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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Parametri

str

-

riferimento al flusso di I / O 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.

Valore di ritorno

str (riferimento al flusso dopo la manipolazione)

Original:

str (reference to the stream after manipulation)

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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

Vedi anche

setprecision	cambiamenti in virgola mobile di precisione 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. (funzione)