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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.double.isnegativeinfinity below:

Double.IsNegativeInfinity(Double) Method (System) | Microsoft Learn

Double.IsNegativeInfinity(Double) Method Definition

Returns a value indicating whether the specified number evaluates to negative infinity.

public:
 static bool IsNegativeInfinity(double d);

public:
 static bool IsNegativeInfinity(double d) = System::Numerics::INumberBase<double>::IsNegativeInfinity;

public static bool IsNegativeInfinity(double d);

static member IsNegativeInfinity : double -> bool

Public Shared Function IsNegativeInfinity (d As Double) As Boolean

Parameters

d: Double

A double-precision floating-point number.

Returns

true if d evaluates to NegativeInfinity; otherwise, false.

Implements Examples

The following code example illustrates the use of IsNegativeInfinity:

// This will return "true".
Console.WriteLine("IsNegativeInfinity(-5.0 / 0) == {0}.", Double.IsNegativeInfinity(-5.0 / 0) ? "true" : "false");

// This will return "true".
printfn $"IsNegativeInfinity(-5.0 / 0) = {Double.IsNegativeInfinity(-5. / 0.)}."

' This will return "True".
Console.Write("IsNegativeInfinity(-5.0 / 0) = ")
If Double.IsNegativeInfinity(-5 / 0) Then
    Console.WriteLine("True.")
Else
    Console.WriteLine("False.")
End If

if (d > Double.MaxValue)
   Console.WriteLine("Your number is bigger than a double.");

if d > Double.MaxValue then
   printfn $"Your number is bigger than a double."

If D > Double.MaxValue Then
    Console.WriteLine("Your number is bigger than a double.")
End If

// This will equal Infinity.
Console.WriteLine("10.0 minus NegativeInfinity equals {0}.", (10.0 - Double.NegativeInfinity).ToString());

// This will equal Infinity.
printfn $"10.0 minus NegativeInfinity equals {10.0 - Double.NegativeInfinity}."

' This will equal Infinity.
Console.WriteLine("10.0 minus NegativeInfinity equals " + (10 - Double.NegativeInfinity).ToString() + ".")

Remarks

Floating-point operations return NegativeInfinity to signal an overflow condition.