Double.IsNaN(Double) Method
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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 -> bool
Public Shared Function IsNaN (d As Double) As Boolean
- d
- Double
A double-precision floating-point number.
true
if d
evaluates to NaN; otherwise, false
.
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
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.
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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