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Single::NaN Field

Represents not a number (NaN). This field is constant.

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

public:
literal float NaN

A method or operator returns NaN when the result of an operation is undefined. For example, the result of dividing zero by zero is NaN, as the following example shows. (But note that dividing a non-zero number by zero returns either PositiveInfinity or NegativeInfinity, depending on the sign of the divisor.)

No code example is currently available or this language may not be supported.

In addition, a method call with a NaN value or an operation on a NaN value returns NaN, as the following example shows.

No code example is currently available or this language may not be supported.

Use the IsNaN method to determine whether a value is not a number. In general, Single operators cannot be used to compare Single::NaN with other Single values, although comparison methods (such as Equals and CompareTo) can. The following example illustrates the difference in behavior between Single comparison operators and methods.

No code example is currently available or this language may not be supported.

The following example demonstrates the NaN constant.

Single zero = 0;

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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