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std::nearbyint

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C++
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
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llround		(C++11)
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nearbyint(C++11)
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definiert in Header <cmath>
float       nearbyint( float arg );
 (seit C++11)
double      nearbyint( double arg );
 (seit C++11)
long double nearbyint( long double arg );
 (seit C++11)
double      nearbyint( Integral arg );
 (seit C++11)
Rundet die Floating-Point-Argument arg auf einen ganzzahligen Wert in Floating-Point-Format, mit dem aktuellen Rundungsmodus .
Original:
Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

arg -
Floating-Point-Wert
Original:
floating point value
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[Bearbeiten] Rückgabewert

Das ganzzahlige Ergebnis der Rundung arg
Original:
The integer result of rounding arg
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[Bearbeiten] Notes

Der einzige Unterschied zwischen std::nearbyint und std::rint ist, dass std::rint kann die FE_INEXACT Gleitkomma-Ausnahme zu erhöhen, während std::nearbyint wirft es nie .
Original:
The only difference between std::nearbyint and std::rint is that std::rint may raise the FE_INEXACT floating-point exception, while std::nearbyint never raises it.
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[Bearbeiten] Beispiel

[edit]
#include <cmath>
#include <cfenv>
#include <iostream>
 
int main()
{
    #pragma STDC FENV_ACCESS ON
    std::fesetround(FE_DOWNWARD);
    std::cout << "rounding using FE_DOWNWARD: \n" << std::fixed
              << " 12.0 ->  " << std::nearbyint(12.0) << '\n'
              << " 12.1 ->  " << std::nearbyint(12.1) << '\n'
              << "-12.1 -> " << std::nearbyint(-12.1) << '\n'
              << " 12.5 ->  " << std::nearbyint(12.5) << '\n'
              << " 12.9 ->  " << std::nearbyint(12.9) << '\n'
              << "-12.9 -> " << std::nearbyint(-12.9) << '\n'
              << " 13.0 ->  " << std::nearbyint(13.0) << '\n';
    std::fesetround(FE_TONEAREST);
    std::cout << "rounding using FE_TONEAREST: \n"
              << " 12.0 ->  " << std::nearbyint(12.0) << '\n'
              << " 12.1 ->  " << std::nearbyint(12.1) << '\n'
              << "-12.1 -> " << std::nearbyint(-12.1) << '\n'
              << " 12.5 ->  " << std::nearbyint(12.5) << '\n'
              << " 12.9 ->  " << std::nearbyint(12.9) << '\n'
              << "-12.9 -> " << std::nearbyint(-12.9) << '\n'
              << " 13.0 ->  " << std::nearbyint(13.0) << '\n';
}

Output: 

rounding using FE_DOWNWARD:
 12.0 ->  12.000000
 12.1 ->  12.000000
-12.1 -> -13.000000
 12.5 ->  12.000000
 12.9 ->  12.000000
-12.9 -> -13.000000
 13.0 ->  13.000000
rounding using FE_TONEAREST: 
 12.0 ->  12.000000
 12.1 ->  12.000000
-12.1 -> -12.000000
 12.5 ->  12.000000
 12.9 ->  13.000000
-12.9 -> -13.000000
 13.0 ->  13.000000

[Bearbeiten] Siehe auch

(C++11)
(C++11)
(C++11)
nächste ganze Zahl mit aktuellen Rundung Modus mit
Ausnahme, wenn das Ergebnis unterscheidet
Original:
nearest integer using current rounding mode with
exception if the result differs
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(Funktion) [edit]
(C++11)
(C++11)
(C++11)
nächste ganze Zahl, Rundung von Null weg in halbwegs Fällen
Original:
nearest integer, rounding away from zero in halfway cases
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(Funktion) [edit]
(C++11)
(C++11)
ab oder legt Rundung Richtung
Original:
gets or sets rounding direction
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(Funktion) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/numeric/math/nearbyint&oldid=29753“