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

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< cpp‎ | numeric‎ | math

 
 
Numéricos biblioteca
Funciones matemáticas comunes
Floating-point medio ambiente
Los números complejos
Matrices numéricas
Pseudo-aleatoria de generación de números
En tiempo de compilación aritmética racional (C++11)
Genéricos operaciones numéricas
Original:
Generic numeric operations
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(C++11)
 
Funciones matemáticas comunes
Funciones
Original:
Functions
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Operaciones básicas
Original:
Basic operations
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Funciones exponenciales
Original:
Exponential functions
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Funciones de energía
Original:
Power functions
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Funciones trigonométricas e hiperbólicas
Original:
Trigonometric and hyperbolic functions
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Error gamma y funciones
Original:
Error and gamma functions
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Más cerca de las operaciones con enteros en coma flotante
Original:
Nearest integer floating point operations
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rintlrintllrint
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Funciones de punto flotante de manipulación
Original:
Floating point manipulation functions
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Clasificación / Comparación
Original:
Classification/Comparison
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Constantes Macro
Original:
Macro constants
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Definido en la cabecera <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)
Redondea el argumento de coma flotante arg a un valor entero en formato de coma flotante, utilizando la modalidad de redondeo actual. Si el resultado difiere de arg (es decir, arg no era ya un valor entero), el FE_INEXACT excepción de punto flotante se eleva .
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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Contenido

[editar] Parámetros

arg -
flotando valor en puntos
Original:
floating point value
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[editar] Valor de retorno

El resultado entero de arg redondeo
Original:
The integer result of rounding arg
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[editar] 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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[editar] 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::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";
    }
}

Salida:

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] Ver también

(C++11)
entero más cercano usando el modo de redondeo actual
Original:
nearest integer using current rounding mode
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(función) [editar]
(C++11)
entero más cercano no es mayor en magnitud que el valor dado
Original:
nearest integer not greater in magnitude than the given value
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(función) [editar]
(C++11)(C++11)
obtiene o establece la dirección redondeo
Original:
gets or sets rounding direction
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(función) [editar]