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std::nearbyint

Da cppreference.com.
< cpp‎ | numeric‎ | math

 
 
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Defined in header <cmath>
float       nearbyint( float arg );
(dal C++11)
double      nearbyint( double arg );
(dal C++11)
long double nearbyint( long double arg );
(dal C++11)
double      nearbyint( Integral arg );
(dal C++11)
Arrotonda il virgola mobile arg argomento in un valore intero in formato di virgola mobile, utilizzando la modalità corrente di arrotondamento.
Original:
Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.
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Indice

[modifica] Parametri

arg -
valore in virgola mobile
Original:
floating point value
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[modifica] Valore di ritorno

Il risultato intero di arg arrotondamento
Original:
The integer result of rounding arg
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[modifica] Note

L'unica differenza tra std::nearbyint e std::rint è che std::rint può sollevare in virgola mobile eccezione FE_INEXACT, pur non essendo mai std::nearbyint solleva.
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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[modifica] Esempio

[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

[modifica] Vedi anche

(C++11)
(C++11)
(C++11)
numero intero più vicino utilizzando la modalità corrente di arrotondamento ad eccezione
se il risultato è diverso
Original:
nearest integer using current rounding mode with
exception if the result differs
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(funzione) [edit]
(C++11)
(C++11)
(C++11)
numero intero più vicino, l'arrotondamento a da zero in caso a metà strada
Original:
nearest integer, rounding away from zero in halfway cases
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(funzione) [edit]
(C++11)
(C++11)
ottiene o imposta la direzione di arrotondamento
Original:
gets or sets rounding direction
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(funzione) [edit]