Espaços nominais
Variantes
Acções

std::rint, std::lrint, std::llrint

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< cpp‎ | numeric‎ | math

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C++
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
Original:
Generic numeric operations
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(C++11)
 
Funções matemáticas comuns
Funções
Original:
Functions
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Operações básicas
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Basic operations
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Funções exponenciais
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Exponential functions
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Funções de poder
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Power functions
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Funções trigonométricas e hiperbólicas
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Trigonometric and hyperbolic functions
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Erro e funções gamma
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Error and gamma functions
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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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rintlrintllrint
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Flutuando funções de manipulação de pontos
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Floating point manipulation functions
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Classificação / Comparação
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Classification/Comparison
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Constantes de macros
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Macro constants
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Definido no cabeçalho <cmath>
int rint( float arg );
 (desde C++11)
int rint( double arg );
 (desde C++11)
int rint( long double arg );
 (desde C++11)
int rint( Integral arg );
 (desde C++11)
long lrint( float arg );
 (desde C++11)
long lrint( double arg );
 (desde C++11)
long lrint( long double arg );
 (desde C++11)
long lrint( Integral arg );
 (desde C++11)
long long llrint( float arg );
 (desde C++11)
long long llrint( double arg );
 (desde C++11)
long long llrint( long double arg );
 (desde C++11)
long long llrint( 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. Se o resultado difere do arg (isto é, não foi arg um valor inteiro já), o FE_INEXACT exceção de ponto flutuante é levantada.
Original:
Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode. If the result differs from arg (i.e., arg was not an integer value already), the floating-point exception FE_INEXACT is raised.
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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::rint(12.0) << '\n'
              << " 12.1 ->  " << std::rint(12.1) << '\n'
              << "-12.1 -> " << std::rint(-12.1) << '\n'
              << " 12.5 ->  " << std::rint(12.5) << '\n'
              << " 12.9 ->  " << std::rint(12.9) << '\n'
              << "-12.9 -> " << std::rint(-12.9) << '\n'
              << " 13.0 ->  " << std::rint(13.0) << '\n';
    std::fesetround(FE_TONEAREST);
    std::cout << "rounding using FE_TONEAREST: \n"
              << " 12.0 ->  " << std::rint(12.0) << '\n'
              << " 12.1 ->  " << std::rint(12.1) << '\n'
              << "-12.1 -> " << std::rint(-12.1) << '\n'
              << " 12.5 ->  " << std::rint(12.5) << '\n'
              << " 12.9 ->  " << std::rint(12.9) << '\n'
              << "-12.9 -> " << std::rint(-12.9) << '\n'
              << " 13.0 ->  " << std::rint(13.0) << '\n';
 
    std::cout << "When rounding 12.0 ";
    std::feclearexcept(FE_ALL_EXCEPT);
    std::rint(12.0);
    if(std::fetestexcept(FE_ALL_EXCEPT) & FE_INEXACT) {
        std::cout << "inexact result reported\n";
    } else {
        std::cout << "inexact result not reported\n";
    }
 
    std::cout << "When rounding 12.1 ";
    std::rint(12.1);
    if(std::fetestexcept(FE_ALL_EXCEPT) & FE_INEXACT) {
        std::cout << "inexact result reported\n";
    } else {
        std::cout << "inexact result not reported\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
When rounding 12.0 inexact result not reported
When rounding 12.1 inexact result reported

[editar] Veja também

(C++11)
número inteiro mais próximo utilizando o modo de arredondamento correntes
Original:
nearest integer using current rounding mode
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(função) [edit]
(C++11)
número inteiro mais próximo não maior em magnitude do que o valor dado
Original:
nearest integer not greater in magnitude than the given value
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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]
Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/numeric/math/rint&oldid=21280"