Single.IsNaN Method (System)

.NET Framework Class Library

Single..::.IsNaN Method

Returns a value indicating whether the specified number evaluates to not a number (NaN).

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

Public Shared Function IsNaN ( _
	f As Single _
) As Boolean

public static bool IsNaN(
	float f
)

public:
static bool IsNaN(
	float f
)

static member IsNaN : 
        f:float32 -> bool

Parameters

f: Type: System..::.Single
A single-precision floating-point number.

Return Value

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

Remarks

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.

Examples

The following code example demonstrates the IsNaN method.


' 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.");
}


// This will return true.
if ( Single::IsNaN( 0 / zero ) )
{
   Console::WriteLine( "Single::IsNan() can determine whether a value is not-a-number." );
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Single Structure

System Namespace

NaN