std::setprecision
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| definiert in Header <iomanip>
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| /*unspecified*/ setprecision( int n ); |
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Wenn in einem Ausdruck verwendet out << setprecision(n) oder in >> setprecision(n), setzt die
precision Parameter der Strom out oder in genau 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. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Inhaltsverzeichnis |
[Bearbeiten] Parameter
| n | - | neuen Wert für Präzision
Original: new value for precision The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[Bearbeiten] Rückgabewert
Gibt ein Objekt vom angegebenen Typ, so dass, wenn
str der Name eines Output-Stream vom Typ std::basic_ostream<CharT, Traits> oder Input-Streams vom Typ std::basic_istream<CharT, Traits>, dann ist der Ausdruck str << setprecision(n) oder str >> setprecision(n) verhält, als ob der folgende Code ausgeführt wurde: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:The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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str.precision(n);
[Bearbeiten] Beispiel
#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
[Bearbeiten] Siehe auch
| (C++11) (C++11) |
Veränderungen Formatierung für Floating-Point I / O verwendet Original: changes formatting used for floating-point I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) |
