Namespace
Varianti

std::setprecision

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Ingresso / uscita manipolatori
Virgola mobile formattazione
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Floating-point formatting
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showpoint
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setprecision
Formattazione Integer
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Defined in header <iomanip>
/*unspecified*/ setprecision( int n );
Quando viene utilizzato in un'espressione out << setprecision(n) o in >> setprecision(n), imposta il parametro precision del flusso out o in esattamente n.
Original:
When used in an expression out << setprecision(n) or in >> setprecision(n), sets the precision parameter of the stream out or in to exactly n.
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Indice

[modifica] Parametri

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

Restituisce un oggetto di tipo tale che, se non specificato str è il nome di un flusso di uscita di std::basic_ostream<CharT, Traits> tipo o di un flusso di ingresso di tipo std::basic_istream<CharT, Traits>, allora l'espressione str << setprecision(n) o str >> setprecision(n) comporta come se il codice è stato eseguito il seguente:
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 an input stream of type std::basic_istream<CharT, Traits>, then the expression str << setprecision(n) or str >> setprecision(n) behaves as if the following code was executed:
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str.precision(n);

[modifica] Esempio

#include <iostream>
#include <iomanip>
#include <cmath>
#include <limits>
int main()
{
    const long double pi = std::acos(-1.L);
    std::cout << "default precision (6): " << pi << '\n'
              << "std::precision(10):    " << std::setprecision(10) << pi << '\n'
              << "max precision:         "
              << std::setprecision(std::numeric_limits<long double>::digits10)
              << pi << '\n';
}

Output:

default precision (6): 3.14159
std::precision(10):    3.141592654
max precision:         3.14159265358979324

[modifica] Vedi anche

Le modifiche di formattazione utilizzati per floating-point I / O
Original:
changes formatting used for floating-point I/O
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(funzione) [edit]