Espacios de nombres
Variantes
Acciones

std::fegetround, std::fesetround

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< cpp‎ | numeric‎ | fenv

 
 
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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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Floating-point medio ambiente
Funciones
Original:
Functions
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feclearexcept(C++11)
fetestexcept(C++11)
feraiseexcept(C++11)
fegetexceptflag
fesetexceptflag
(C++11)
(C++11)
fegetround
fesetround
(C++11)
(C++11)
fegetenv
fesetenv
(C++11)
feholdexcept(C++11)
feupdateenv(C++11)
Constantes Macro
Original:
Macro constants
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FE_ALL_EXCEPT
FE_DIVBYZERO
FE_INEXACT
FE_INVALID
FE_OVERFLOW
FE_UNDERFLOW
(C++11)
FE_DOWNWARD
FE_TONEAREST
FE_TOWARDZERO
FE_UPWARD
(C++11)
FE_DFL_ENV(C++11)
 
Defined in header <cfenv>
int fesetround( int round )
(1) (desde C++11)
int fegetround()
(2) (desde C++11)
1)
Los intentos para establecer la dirección de redondeo de punto flotante igual a la round argumento, que se espera que sea una de las flotando macros punto de redondeo .
Original:
Attempts to establish the floating-point rounding direction equal to the argument round, which is expected to be one of the flotando macros punto de redondeo.
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2)
Devuelve el valor de la flotando macro punto de redondeo que corresponde a la dirección actual de redondeo .
Original:
Returns the value of the flotando macro punto de redondeo that corresponds to the current rounding direction.
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Contenido

[editar] Parámetros

round -
dirección redondeo, uno de flotando macros punto de redondeo
Original:
rounding direction, one of flotando macros punto de redondeo
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[editar] Valor de retorno

1)
0 en caso de éxito, no cero en caso contrario .
Original:
0 on success, non-zero otherwise.
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2)
la flotando macro punto de redondeo que describe la dirección actual de redondeo o un valor negativo si la dirección no se puede determinar
Original:
the flotando macro punto de redondeo describing the current rounding direction or a negative value if the direction cannot be determined
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[editar] Ejemplo

[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

[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) [edit]
(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
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(función) [edit]