IsNegativeInfinity Method

# Double.IsNegativeInfinity Method

.NET Framework 3.0
Returns a value indicating whether the specified number evaluates to negative infinity.

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

## Syntax

```'Declaration
Public Shared Function IsNegativeInfinity ( _
d As Double _
) As Boolean
'Usage
Dim d As Double
Dim returnValue As Boolean

returnValue = Double.IsNegativeInfinity(d)
```
```public static boolean IsNegativeInfinity (
double d
)
```
```public static function IsNegativeInfinity (
d : double
) : boolean
```
```Not applicable.
```

#### 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

The following code example illustrates the use of IsNegativeInfinity:

```        ' 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() + ".")

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

...

if (d.doubleValue() > Double.MAX_VALUE) {
Console.WriteLine("Your number is bigger than a double.");
}

...

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

```

## Platforms

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

## Version Information

#### .NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

#### .NET Compact Framework

Supported in: 2.0, 1.0

#### XNA Framework

Supported in: 1.0