Double.IsNegativeInfinity(Double) 方法

定義

命名空間:

System

組件:

System.Runtime.dll

來源:

Double.cs

傳回值，指出指定的數字是否計算結果為負的無限大。

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

參數

d

Double

雙精確度浮點數。

傳回

Boolean

如果 d 計算結果為 NegativeInfinity，則為 true；否則為 false。

實作

IsNegativeInfinity(TSelf)

範例

下列程式碼範例說明 如何使用 IsNegativeInfinity ：

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

// 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)
   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) );

// 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() + ".")

備註

浮點運算會返回 NegativeInfinity 以發出溢位條件的訊號。

另請參閱

• IsInfinity(Double)
• IsPositiveInfinity(Double)
• PositiveInfinity
• NegativeInfinity