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# Double.IsNegativeInfinity Method

.NET Framework 1.1

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

```[Visual Basic]
Public Shared Function IsNegativeInfinity( _
ByVal d As Double _
) As Boolean
[C#]
public static bool IsNegativeInfinity(
double d
);
[C++]
public: static bool IsNegativeInfinity(
double d
);
[JScript]
public static function IsNegativeInfinity(
d : double
) : Boolean;```

#### Parameters

d
A double-precision floating point number.

#### Return Value

true if d evaluates to NegativeInfinity; otherwise, false.

#### Remarks

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

#### Example

[Visual Basic, C#, C++] The following code sample illustrates the use of IsNegativeInfinity:

```[Visual Basic]
' 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 Then
Console.WriteLine("Your number is bigger than a double.")
End If
. . .
' This will equal Infinity.
Console.WriteLine("10.0 minus NegativeInfinity equals " + (10 - Double.NegativeInfinity).ToString() + ".")

[C#]
// This will return "true".
Console.WriteLine("IsNegativeInfinity(-5.0 / 0) == {0}.", Double.IsNegativeInfinity(-5.0 / 0) ? "true" : "false");
. . .
if (d > Double.MaxValue)
{
Console.WriteLine("Your number is bigger than a double.");
}
. . .
// This will equal Infinity.
Console.WriteLine("10.0 minus NegativeInfinity equals {0}.", (10.0 - Double.NegativeInfinity).ToString());

[C++]
// This will return S"true".
Console::WriteLine(S"IsNegativeInfinity(-5.0 / 0) == {0}.", Double::IsNegativeInfinity(-5.0 / zero) ? S"true" : S"false");
. . .
if (d > Double::MaxValue) {
Console::WriteLine(S"Your number is bigger than a double.");
}
. . .
// This will equal Infinity.
Console::WriteLine(S"10.0 minus NegativeInfinity equals {0}.", __box((10.0 - Double::NegativeInfinity)));
```

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

#### Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard