Namespace
Varianti

std::setw

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
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Streams
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Astrazioni
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Ingresso / uscita manipolatori
Virgola mobile formattazione
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Floating-point formatting
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Formattazione Integer
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Integer formatting
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Formattazione Boolean
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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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setfill
setw
Di formattazione
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Other formatting
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Elaborazione degli spazi vuoti
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Whitespace processing
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Uscita di lavaggio
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Output flushing
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Flag di stato manipolazione
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Status flags manipulation
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Tempo e denaro I / O
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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 <iomanip>
/*unspecified*/ setw( int n );
Quando viene utilizzato in un'espressione out << setw(n) o in >> setw(n), imposta il parametro width del flusso out o in esattamente n. Questo valore non è "appiccicoso": l'ingresso successivo o il funzionamento di uscita che viene influenzato dal valore del campo width del torrente, resetta a zero (che significa "non specificato").
Original:
When used in an expression out << setw(n) or in >> setw(n), sets the width parameter of the stream out or in to exactly n. This value is not "sticky": the next input or output operation that is affected by the value of the stream's width field, resets it to zero (meaning "unspecified").
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Indice

[modifica] Parametri

n -
nuovo valore per la larghezza
Original:
new value for width
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[modifica] Valore di ritorno

Restituisce un oggetto di tipo non specificato tale che se str è il nome di un flusso di output di tipo std::basic_ostream<CharT, Traits> o std::basic_istream<CharT, Traits>, allora l'espressione str << setw(n) str >> setw(n) o si comporta come se il codice riportato di seguito è stato eseguito:
Original:
Returns an object of unspecified type such that if str is the name of an output stream of type std::basic_ostream<CharT, Traits> or std::basic_istream<CharT, Traits>, then the expression str << setw(n) or str >> setw(n) behaves as if the following code was executed:
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str.width(n);

[modifica] Esempio

#include <sstream>
#include <iostream>
#include <iomanip>
int main()
{
        std::cout << "no setw: " << 42 << '\n'
                  << "setw(6): " << std::setw(6) << 42 << '\n';
        std::istringstream is("hello, world");
        char arr[10];
        is >> std::setw(6) >> arr;
        std::cout << "Input from \"" << is.str() << "\" with setw(6) gave \"" << arr << "\"\n";
}

Output:

no setw: 42
setw(6):     42
Input from "hello, world" with setw(6) gave "hello"

[modifica] Vedi anche

manages field width
(membro pubblico of std::ios_base funzione) [edit]
cambia il carattere di riempimento
Original:
changes the fill character
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(funzione di modello) [edit]