Double.IsNaN(Double) Method
Definition
Important
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Returns a value that indicates whether the specified value is not a number (NaN).
public:
static bool IsNaN(double d);public:
static bool IsNaN(double d) = System::Numerics::INumberBase<double>::IsNaN;public static bool IsNaN (double d);static member IsNaN : double -> boolPublic Shared Function IsNaN (d As Double) As BooleanParameters
- d
- Double
A double-precision floating-point number.
Returns
true if d evaluates to NaN; otherwise, false.
Implements
Examples
The following code example illustrates the use of IsNaN:
// This will return true.
if ( Double::IsNaN( 0 / zero ) )
{
Console::WriteLine( "Double::IsNan() can determine whether a value is not-a-number." );
}
// This will return true.
if (Double.IsNaN(0 / zero))
Console.WriteLine("Double.IsNan() can determine whether a value is not-a-number.");
// This will return true.
if Double.IsNaN(0. / zero) then
printfn "Double.IsNan() can determine whether a value is not-a-number."
' This will return true.
If Double.IsNaN(0 / zero) Then
Console.WriteLine("Double.IsNan() can determine whether a value is not-a-number.")
End If
Remarks
Floating-point operations return NaN to signal that result of the operation is undefined. For example, dividing 0.0 by 0.0 results in NaN.
Note
IsNaN returns false if a Double value is either PositiveInfinity or NegativeInfinity. To test for these values, use the IsInfinity, IsPositiveInfinity, and IsNegativeInfinity methods.
