Math.Pow(Double, Double) 方法

定義

命名空間:: System

組件:: mscorlib.dll, System.Runtime.Extensions.dll

組件:: netstandard.dll, System.Runtime.dll

組件:: System.Runtime.Extensions.dll

組件:: mscorlib.dll

組件:: netstandard.dll

來源:: Math.cs

來源:: Math.cs

來源:: Math.cs

來源:: Math.cs

來源:: Math.cs

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

回傳一個指定數字，提升至指定冪次方。

public:
 static double Pow(double x, double y);

public static double Pow(double x, double y);

static member Pow : double * double -> double

Public Shared Function Pow (x As Double, y As Double) As Double

參數

x: Double

一個雙精度浮點數，需提升為冪次方。

y: Double

一個雙精度浮點數，指定冪次。

傳回

Double

x數字被提升為的冪次y方。

範例

以下範例使用此 Pow 方法計算將 2 提升至 0 至 32 的冪次方所得到的值。

int value = 2;
for (int power = 0; power <= 32; power++)
   Console.WriteLine($"{value}^{power} = {(long)Math.Pow(value, power):N0} (0x{(long)Math.Pow(value, power):X})");

// The example displays the following output:
//     2^0 = 1 (0x1)
//     2^1 = 2 (0x2)
//     2^2 = 4 (0x4)
//     2^3 = 8 (0x8)
//     2^4 = 16 (0x10)
//     2^5 = 32 (0x20)
//     2^6 = 64 (0x40)
//     2^7 = 128 (0x80)
//     2^8 = 256 (0x100)
//     2^9 = 512 (0x200)
//     2^10 = 1,024 (0x400)
//     2^11 = 2,048 (0x800)
//     2^12 = 4,096 (0x1000)
//     2^13 = 8,192 (0x2000)
//     2^14 = 16,384 (0x4000)
//     2^15 = 32,768 (0x8000)
//     2^16 = 65,536 (0x10000)
//     2^17 = 131,072 (0x20000)
//     2^18 = 262,144 (0x40000)
//     2^19 = 524,288 (0x80000)
//     2^20 = 1,048,576 (0x100000)
//     2^21 = 2,097,152 (0x200000)
//     2^22 = 4,194,304 (0x400000)
//     2^23 = 8,388,608 (0x800000)
//     2^24 = 16,777,216 (0x1000000)
//     2^25 = 33,554,432 (0x2000000)
//     2^26 = 67,108,864 (0x4000000)
//     2^27 = 134,217,728 (0x8000000)
//     2^28 = 268,435,456 (0x10000000)
//     2^29 = 536,870,912 (0x20000000)
//     2^30 = 1,073,741,824 (0x40000000)
//     2^31 = 2,147,483,648 (0x80000000)
//     2^32 = 4,294,967,296 (0x100000000)

open System

let value = 2
for power = 0 to 32 do
    printfn $"{value}^{power} = {Math.Pow(value, power) |> int64:N0} (0x{Math.Pow(value, power) |> int64:X})"

// The example displays the following output:
//     2^0 = 1 (0x1)
//     2^1 = 2 (0x2)
//     2^2 = 4 (0x4)
//     2^3 = 8 (0x8)
//     2^4 = 16 (0x10)
//     2^5 = 32 (0x20)
//     2^6 = 64 (0x40)
//     2^7 = 128 (0x80)
//     2^8 = 256 (0x100)
//     2^9 = 512 (0x200)
//     2^10 = 1,024 (0x400)
//     2^11 = 2,048 (0x800)
//     2^12 = 4,096 (0x1000)
//     2^13 = 8,192 (0x2000)
//     2^14 = 16,384 (0x4000)
//     2^15 = 32,768 (0x8000)
//     2^16 = 65,536 (0x10000)
//     2^17 = 131,072 (0x20000)
//     2^18 = 262,144 (0x40000)
//     2^19 = 524,288 (0x80000)
//     2^20 = 1,048,576 (0x100000)
//     2^21 = 2,097,152 (0x200000)
//     2^22 = 4,194,304 (0x400000)
//     2^23 = 8,388,608 (0x800000)
//     2^24 = 16,777,216 (0x1000000)
//     2^25 = 33,554,432 (0x2000000)
//     2^26 = 67,108,864 (0x4000000)
//     2^27 = 134,217,728 (0x8000000)
//     2^28 = 268,435,456 (0x10000000)
//     2^29 = 536,870,912 (0x20000000)
//     2^30 = 1,073,741,824 (0x40000000)
//     2^31 = 2,147,483,648 (0x80000000)
//     2^32 = 4,294,967,296 (0x100000000)

Public Module Example
   Public Sub Main
      Dim value As Integer = 2
      For power As Integer = 0 To 32
         Console.WriteLine("{0}^{1} = {2:N0} (0x{2:X})", _
                           value, power, CLng(Math.Pow(value, power)))
      Next
   End Sub
End Module
' The example displays the following output:
'     2^0 = 1 (0x1)
'     2^1 = 2 (0x2)
'     2^2 = 4 (0x4)
'     2^3 = 8 (0x8)
'     2^4 = 16 (0x10)
'     2^5 = 32 (0x20)
'     2^6 = 64 (0x40)
'     2^7 = 128 (0x80)
'     2^8 = 256 (0x100)
'     2^9 = 512 (0x200)
'     2^10 = 1,024 (0x400)
'     2^11 = 2,048 (0x800)
'     2^12 = 4,096 (0x1000)
'     2^13 = 8,192 (0x2000)
'     2^14 = 16,384 (0x4000)
'     2^15 = 32,768 (0x8000)
'     2^16 = 65,536 (0x10000)
'     2^17 = 131,072 (0x20000)
'     2^18 = 262,144 (0x40000)
'     2^19 = 524,288 (0x80000)
'     2^20 = 1,048,576 (0x100000)
'     2^21 = 2,097,152 (0x200000)
'     2^22 = 4,194,304 (0x400000)
'     2^23 = 8,388,608 (0x800000)
'     2^24 = 16,777,216 (0x1000000)
'     2^25 = 33,554,432 (0x2000000)
'     2^26 = 67,108,864 (0x4000000)
'     2^27 = 134,217,728 (0x8000000)
'     2^28 = 268,435,456 (0x10000000)
'     2^29 = 536,870,912 (0x20000000)
'     2^30 = 1,073,741,824 (0x40000000)
'     2^31 = 2,147,483,648 (0x80000000)
'     2^32 = 4,294,967,296 (0x100000000)

備註

下表顯示當和參數指定xy各種值或值範圍時的回傳值。如需詳細資訊，請參閱Double.PositiveInfinity、Double.NegativeInfinity及 Double.NaN。

x	y	返回值
除了 `NaN`	±	1
`NaN`	±	1*
`NaN`	除了 0 以外的任何值	`NaN`*
±	< 0 和奇整數	`NegativeInfinity` 或 `PositiveInfinity`
±	`NegativeInfinity`	`PositiveInfinity`
±	`PositiveInfinity`	+0
±	> 0 和奇整數	±
-1	`NegativeInfinity` 或 `PositiveInfinity`	1
+1	除了 `NaN`	1
+1	`NaN`	1*
除了 1 以外的任何值	`NaN`	`NaN`*
-1 < x < 1	`PositiveInfinity`	+0
< -1 或 > 1	`PositiveInfinity`	`PositiveInfinity`
-1 < x < 1	`NegativeInfinity`	`PositiveInfinity`
< -1 或 > 1	`NegativeInfinity`	+0
`PositiveInfinity`	< 0	+0
`PositiveInfinity`	> 0	`PositiveInfinity`
`NegativeInfinity`	< 0 和有限，奇數	0-
`NegativeInfinity`	> 0 和有限，奇數	`NegativeInfinity`
`NegativeInfinity`	< 0 且有限，且非奇整數	+0
`NegativeInfinity`	> 0 且有限，且非奇整數	`PositiveInfinity`
±	< 0 且有限，且非奇整數	`PositiveInfinity`
±	> 0 且有限，且非奇整數	+0
< 0，但又不是 `NegativeInfinity`	有限非整數	`NaN`

* 這些列不會出現在 pow定義的完整規則中。之所以收錄這些，是因為.NET 禁用了 IEEE 754 浮點例外，因此無法區分 qNaN（安靜的 NaN）與 sNaN（訊號 NaN）。 IEEE 754 規範允許此例外停用。

此方法會呼叫底層的 C 執行時，且不同作業系統或架構間的精確結果或有效輸入範圍可能有所不同。

適用於

另請參閱

Sqrt(Double)

意見反應

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