std::nearbyint

 

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Defined in header <cmath>
float       nearbyint( float arg );		(desde C++11)
double      nearbyint( double arg );		(desde C++11)
long double nearbyint( long double arg );		(desde C++11)
double      nearbyint( Integral arg );		(desde C++11)

Redondea el argumento de coma flotante arg a un valor entero en formato de coma flotante, utilizando la modalidad de redondeo actual .

Original:

Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.

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Parámetros

arg

-

flotando valor en puntos Original: floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

El resultado entero de arg redondeo

Original:

The integer result of rounding arg

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Notas

La única diferencia entre std::nearbyint y std::rint es que std::rint puede elevar el FE_INEXACT de punto flotante de excepción, mientras que nunca std::nearbyint plantea .

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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Ejemplo

#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

Ver también

rint lrint llrint (C++11) (C++11) (C++11)	entero más cercano usando el modo de redondeo actual con excepción si el resultado es diferente Original: nearest integer using current rounding mode with exception if the result differs The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
round lround llround (C++11) (C++11) (C++11)	entero más próximo, redondeando lejos de cero en los casos de reinserción Original: nearest integer, rounding away from zero in halfway cases The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
fegetround fesetround (C++11) (C++11)	obtiene o establece la dirección redondeo Original: gets or sets rounding direction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)