Double.IsNegativeInfinity(Double) 方法
重要
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返回一个值，通过该值指示指定数字是否计算为负无穷大。
public:
static bool IsNegativeInfinity(double d);public:
static bool IsNegativeInfinity(double d) = System::Numerics::INumberBase<double>::IsNegativeInfinity;C#
public static bool IsNegativeInfinity(double d);static member IsNegativeInfinity : double -> boolPublic Shared Function IsNegativeInfinity (d As Double) As Boolean- d
- Double
一个双精度浮点数。
如果 d 的计算结果为 NegativeInfinity，则为 true；否则为 false。
下面的代码示例演示如何使用 IsNegativeInfinity：
// This will return S"true".
Console::WriteLine( "IsNegativeInfinity(-5.0 / 0) == {0}.", Double::IsNegativeInfinity( -5.0 / zero ) ? (String^)"true" : "false" );
C#
// 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." );
}
C#
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) );
C#
// 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() + ".")
浮点运算返回 NegativeInfinity 以指示溢出条件。
| 产品 | 版本 |
|---|---|
| .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, 10 |
| .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 |
