共用方式為

Math.Pow(Double, Double) 方法

  • 參考

定義

命名空間:
System
組件:
System.Runtime.Extensions.dll
組件:
System.Runtime.dll
組件:
mscorlib.dll
組件:
netstandard.dll
來源:
Math.cs
來源:
Math.cs
來源:
Math.cs

傳回具有指定乘冪數的指定數字。

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

雙精確度浮點數，做為乘冪數。

y
Double

雙精確度浮點數，用來指定乘冪數。

傳回

Double

數字 x 的 y 次方。

範例

下列範例會 Pow 使用 方法來計算從引發 2 到從 0 到 32 的電源所產生的值。

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

下表指出針對 和 y 參數指定x各種值或值範圍時的傳回值。 如需詳細資訊，請參閱Double.PositiveInfinity、Double.NegativeInfinity和Double.NaN。

x y 傳回值
除了以外的任何值 NaN ±0 1
NaN ±0 .NET Framework) * 上的 1 個 NaN (
NaN 0 以外的任何值 NaN*
±0 < 0 和奇數整數 NegativeInfinity 或 PositiveInfinity
±0 NegativeInfinity PositiveInfinity
±0 PositiveInfinity +0
±0 > 0 和奇數整數 ±0
-1 NegativeInfinity 或 PositiveInfinity 1
+1 除了以外的任何值 NaN 1
+1 NaN .NET Framework) * 上的 1 個 NaN (
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 和有限和奇數整數 -0
NegativeInfinity > 0 和有限和奇數整數 NegativeInfinity
NegativeInfinity < 0 和有限，而不是奇數整數 +0
NegativeInfinity > 0 和有限，而不是奇數整數 PositiveInfinity
±0 < 0 和有限，而不是奇數整數 PositiveInfinity
±0 > 0 和有限，而不是奇數整數 +0
< 0 但不是 NegativeInfinity 有限非整數 NaN

* 這些數據列不會出現在 的完整規則 pow 集中，如 IEEE Standard for Floating-Point 算術所定義。 這裡包含它們，因為 .NET 會停用 IEEE 754 浮點例外狀況，因此不會區分 qNaN (無訊息 NaN) 和 sNaN (發出 NaN) 訊號。 IEEE 754 規格允許此例外狀況停用。

這個方法會呼叫基礎 C 運行時間，而且不同的操作系統或架構之間，確切的結果或有效輸入範圍可能會不同。

適用於

另請參閱