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std::nearbyint

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< cpp‎ | numeric‎ | math

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Original:
Generic numeric operations
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Funções matemáticas comuns
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Número inteiro mais próximo de operações de ponto flutuante
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Nearest integer floating point operations
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nearbyint
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Flutuando funções de manipulação de pontos
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Definido no cabeçalho <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)
Arredonda o arg argumento de ponto flutuante para um valor inteiro no formato de ponto flutuante, usando o modo de arredondamento atual.
Original:
Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.
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Índice

[editar] Parâmetros

arg -
flutuando valor de ponto
Original:
floating point value
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[editar] Valor de retorno

O resultado inteiro do arg arredondamento
Original:
The integer result of rounding arg
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[editar] Notas

A única diferença entre std::nearbyint e std::rint é que std::rint pode aumentar o FE_INEXACT exceção de ponto flutuante, sem nunca std::nearbyint levanta-lo.
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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[editar] Exemplo

#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';
}

Saída: 

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

[editar] Veja também

(C++11)
(C++11)
(C++11)
número inteiro mais próximo usando o modo de arredondamento atual com exceção
se o resultado é diferente
Original:
nearest integer using current rounding mode with
exception if the result differs
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(função) [edit]
(C++11)
(C++11)
(C++11)
número inteiro mais próximo de arredondamento, de zero em casos meio
Original:
nearest integer, rounding away from zero in halfway cases
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(função) [edit]
(C++11)
(C++11)
obtém ou define direção arredondamento
Original:
gets or sets rounding direction
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(função) [edit]
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