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SingleIsNaN Method
 
System_CAPS_noteNote

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Returns a value that indicates whether the specified value is not a number ( NaN).

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public static bool IsNaN(
	float f
)
public:
static bool IsNaN(
	float f
)
static member IsNaN : 
        f:float32 -> bool
Public Shared Function IsNaN (
	f As Single
) As Boolean

Parameters

f
Type:

A single-precision floating-point number.

Return Value

Type:

true if f evaluates to not a number ( NaN); otherwise, false.

Floating-point operations return NaN to signal that that result of the operation is undefined. For example, dividing 0.0 by 0.0 results in NaN.

System_CAPS_noteNote

IsNaN returns false if a Single value is either PositiveInfinity or NegativeInfinity. To test for these values, use the IsInfinity, IsPositiveInfinity, and IsNegativeInfinity methods.

The following code example demonstrates the IsNaN method.

// This will return true.
if (Single.IsNaN(0 / zero))
{
    Console.WriteLine("Single.IsNan() can determine whether a value is not-a-number.");
}
' This will return true.
If Single.IsNaN(0 / zero) Then
    Console.WriteLine("Single.IsNan() can determine whether a value is not-a-number.")
End If
// This will return true.
if ( Single::IsNaN( 0 / zero ) )
{
   Console::WriteLine( "Single::IsNan() can determine whether a value is not-a-number." );
}
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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