IsNaN Method

Single.IsNaN Method (Single)

 

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
)

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.

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.");
}

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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