# Double.NaNDouble.NaNDouble.NaNDouble.NaN Field

## Definición

Representa un valor no numérico (`NaN`).Represents a value that is not a number (`NaN`). Este campo es constante.This field is constant.

``public: double NaN = NaN;``
``public const double NaN = NaN;``
``val mutable NaN : double``
``Public Const NaN As Double  = NaN``

## Ejemplos

En el siguiente ejemplo se describe el uso de NaN.The following example illustrates the use of NaN:

``````Double zero = 0;

// This condition will return false.
if ( (0 / zero) == Double::NaN )
{
Console::WriteLine( "0 / 0 can be tested with Double::NaN." );
}
else
{
Console::WriteLine( "0 / 0 cannot be tested with Double::NaN; use Double::IsNan() instead." );
}
``````
``````Double zero = 0;

// This condition will return false.
if ((0 / zero) == Double.NaN)
Console.WriteLine("0 / 0 can be tested with Double.NaN.");
else
Console.WriteLine("0 / 0 cannot be tested with Double.NaN; use Double.IsNan() instead.");
``````
``````Dim zero As Double = 0

' This condition will return false.
If (0 / zero) = Double.NaN Then
Console.WriteLine("0 / 0 can be tested with Double.NaN.")
Else
Console.WriteLine("0 / 0 cannot be tested with Double.NaN; use Double.IsNan() instead.")
End If
``````

## Comentarios

Devuelve un método u operador NaN cuando el resultado de una operación es indefinido.A method or operator returns NaN when the result of an operation is undefined. Por ejemplo, es el resultado de dividir cero por cero NaN, tal y como se muestra en el ejemplo siguiente.For example, the result of dividing zero by zero is NaN, as the following example shows. (Pero tenga en cuenta que al dividir un número distinto de cero por cero devuelve PositiveInfinity o NegativeInfinity, según el signo del divisor.)(But note that dividing a non-zero number by zero returns either PositiveInfinity or NegativeInfinity, depending on the sign of the divisor.)

``````double zero = 0.0;
Console.WriteLine("{0} / {1} = {2}", zero, zero, zero/zero);
// The example displays the following output:
//         0 / 0 = NaN
``````
``````Dim zero As Double = 0
Console.WriteLine("{0} / {1} = {2}", zero, zero, zero/zero)
' The example displays the following output:
'         0 / 0 = NaN
``````

Además, llamar un método con un NaN valor o una operación en un NaN valor devuelve NaN, tal y como se muestra en el ejemplo siguiente.In addition, a method call with a NaN value or an operation on a NaN value returns NaN, as the following example shows.

``````double nan1 = Double.NaN;

Console.WriteLine("{0} + {1} = {2}", 3, nan1, 3 + nan1);
Console.WriteLine("Abs({0}) = {1}", nan1, Math.Abs(nan1));
// The example displays the following output:
//       3 + NaN = NaN
//       Abs(NaN) = NaN
``````
``````Dim nan1 As Double = Double.NaN

Console.WriteLine("{0} + {1} = {2}", 3, nan1, 3 + nan1)
Console.WriteLine("Abs({0}) = {1}", nan1, Math.Abs(nan1))
' The example displays the following output:
'       3 + NaN = NaN
'       Abs(NaN) = NaN
``````

Use el IsNaN método para determinar si un valor no es un número.Use the IsNaN method to determine whether a value is not a number. El Equality operador considera que dos NaN los valores sean iguales entre sí.The Equality operator considers two NaN values to be unequal to one another. En general, Double operadores no se puede usar para comparar Double.NaNDouble valores, aunque los métodos de comparación (como Equals y CompareTo) puede.In general, Double operators cannot be used to compare Double.NaN with other Double values, although comparison methods (such as Equals and CompareTo) can. El ejemplo siguiente ilustra la diferencia de comportamiento entre Double métodos y operadores de comparación.The following example illustrates the difference in behavior between Double comparison operators and methods.

``````using System;

public class Example
{
public static void Main()
{
Console.WriteLine("NaN == NaN: {0}", Double.NaN == Double.NaN);
Console.WriteLine("NaN != NaN: {0}", Double.NaN != Double.NaN);
Console.WriteLine("NaN.Equals(NaN): {0}", Double.NaN.Equals(Double.NaN));
Console.WriteLine("! NaN.Equals(NaN): {0}", ! Double.NaN.Equals(Double.NaN));
Console.WriteLine("IsNaN: {0}", Double.IsNaN(Double.NaN));

Console.WriteLine("\nNaN > NaN: {0}", Double.NaN > Double.NaN);
Console.WriteLine("NaN >= NaN: {0}", Double.NaN >= Double.NaN);
Console.WriteLine("NaN < NaN: {0}", Double.NaN < Double.NaN);
Console.WriteLine("NaN < 100.0: {0}", Double.NaN < 100.0);
Console.WriteLine("NaN <= 100.0: {0}", Double.NaN <= 100.0);
Console.WriteLine("NaN >= 100.0: {0}", Double.NaN > 100.0);
Console.WriteLine("NaN.CompareTo(NaN): {0}", Double.NaN.CompareTo(Double.NaN));
Console.WriteLine("NaN.CompareTo(100.0): {0}", Double.NaN.CompareTo(100.0));
Console.WriteLine("(100.0).CompareTo(Double.NaN): {0}", (100.0).CompareTo(Double.NaN));
}
}
// The example displays the following output:
//       NaN == NaN: False
//       NaN != NaN: True
//       NaN.Equals(NaN): True
//       ! NaN.Equals(NaN): False
//       IsNaN: True
//
//       NaN > NaN: False
//       NaN >= NaN: False
//       NaN < NaN: False
//       NaN < 100.0: False
//       NaN <= 100.0: False
//       NaN >= 100.0: False
//       NaN.CompareTo(NaN): 0
//       NaN.CompareTo(100.0): -1
//       (100.0).CompareTo(Double.NaN): 1
``````
``````Module Example
Public Sub Main()
Console.WriteLine("NaN = NaN: {0}", Double.NaN = Double.NaN)
Console.WriteLine("NaN <> NaN: {0}", Double.NaN <> Double.NaN)
Console.WriteLine("NaN.Equals(NaN): {0}", Double.NaN.Equals(Double.NaN))
Console.WriteLine("Not NaN.Equals(NaN): {0}", Not Double.NaN.Equals(Double.NaN))
Console.WriteLine("IsNaN: {0}", Double.IsNaN(Double.NaN))
Console.WriteLine()
Console.WriteLine("NaN > NaN: {0}", Double.NaN > 100.0)
Console.WriteLine("NaN >= NaN: {0}", Double.NaN >= 100.0)
Console.WriteLine("NaN < NaN: {0}", Double.NaN < Double.NaN)
Console.WriteLine("NaN < 100.0: {0}", Double.NaN < 100.0)
Console.WriteLine("NaN <= 100.0: {0}", Double.NaN <= 100.0)
Console.WriteLine("NaN >= 100.0: {0}", Double.NaN > 100.0)
Console.WriteLine("NaN.CompareTo(NaN): {0}", Double.NaN.CompareTo(Double.Nan))
Console.WriteLine("NaN.CompareTo(100.0): {0}", Double.NaN.CompareTo(100.0))
Console.WriteLine("(100.0).CompareTo(Double.NaN): {0}", (100.0).CompareTo(Double.NaN))
End Sub
End Module
' The example displays the following output:
'       NaN == NaN: False
'       NaN != NaN: True
'       NaN.Equals(NaN): True
'       ! NaN.Equals(NaN): False
'       IsNaN: True
'
'       NaN > NaN: False
'       NaN >= NaN: False
'       NaN < NaN: False
'       NaN < 100.0: False
'       NaN <= 100.0: False
'       NaN >= 100.0: False
'       NaN.CompareTo(NaN): 0
'       NaN.CompareTo(100.0): -1
'       (100.0).CompareTo(Double.NaN): 1
``````