std::numeric_limits::quiet_NaN
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static T quiet_NaN()
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(hasta C++11) | |
static constexpr T quiet_NaN()
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(desde C++11) | |
Devuelve el valor especial "no un número tranquila", como se representa por la
T tipo de punto flotante. Sólo tiene sentido si std::numeric_limits<T>::has_quiet_NaN == true. En IEEE 754, la representación binaria más común de números de punto flotante, cualquier valor con todos los bits del conjunto de exponente y al menos un bit de la serie fracción representa un NaN. Se definido por la implantación que los valores de la fracción representan NaNs tranquilas o singaling, y si el bit de signo es significativo .Original:
Returns the special value "quiet no un número", as represented by the floating-point type
T. Only meaningful if std::numeric_limits<T>::has_quiet_NaN == true. In IEEE 754, the most common binary representation of floating-point numbers, any value with all bits of the exponent set and at least one bit of the fraction set represents a NaN. It is implementation-defined which values of the fraction represent quiet or singaling NaNs, and whether the sign bit is meaningful.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Valor de retorno
T
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std::numeric_limits<T>::quiet_NaN()
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| /* non-specialized */ | T();
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bool
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false
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char
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0
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signed char
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0
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unsigned char
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0
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wchar_t
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0
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char16_t
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0
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char32_t
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0
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short
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0
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unsigned short
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0
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int
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0
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unsigned int
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0
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long
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0
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unsigned long
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0
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long long
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0
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unsigned long long
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0
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float
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NAN u otra aplicación definida por NaN
Original: NAN or another implementation-defined NaN The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
double
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definido por la implantación
Original: implementation-defined The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
long double
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definido por la implantación
Original: implementation-defined The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Excepciones
Notas
A NaN nunca compara igual a sí mismo. Copia de un NaN no puede preservar su representación poco .
Original:
A NaN never compares equal to itself. Copying a NaN may not preserve its bit representation.
The text has been machine-translated via Google Translate.
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Ejemplo
Varias maneras de generar un NaN (la cadena de salida es específica del compilador)
Original:
Several ways to generate a NaN (the output string is compiler-specific)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Ejecuta este código
#include <iostream>
#include <limits>
#include <cmath>
int main()
{
std::cout << std::numeric_limits<double>::quiet_NaN() << ' '
<< std::numeric_limits<double>::signaling_NaN() << ' '
<< std::acos(2) << ' '
<< std::tgamma(-1) << ' '
<< std::log(-1) << ' '
<< std::sqrt(-1) << ' '
<< 0 / 0.0 << '\n';
std::cout << "NaN == NaN? " << std::boolalpha
<< ( std::numeric_limits<double>::quiet_NaN()
== std::numeric_limits<double>::quiet_NaN() ) << '\n';
}
Salida:
nan nan nan nan nan -nan -nan
NaN == NaN? false
Ver también
[estático] |
identifica tipos de punto flotante que puede representar el valor especial "tranquilo, no un número" (NaN) Original: identifies floating-point types that can represent the special value "quiet not-a-number" (NaN) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante miembro pública estática) |
[estático] |
devuelve un valor NaN de señalización de lo dado tipo de punto flotante Original: returns a signaling NaN value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro estática pública) |