Math.Pow(Double, Double) 方法

定義

命名空間:

System

組件:

System.Runtime.Extensions.dll

組件:

System.Runtime.dll

組件:

netstandard.dll

組件:

mscorlib.dll

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 Pow 會使用方法來計算從0到32的乘冪所產生的值。

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)

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

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

參數	傳回值
x或 y = NaN 。	NaN
x = 除了 NaN ; y = 0 以外的任何值。	1
x = NegativeInfinity; y < 0。	0
x = NegativeInfinity; y 為正奇數整數。	NegativeInfinity
x = NegativeInfinity; y 是正數，但不是奇數整數。	PositiveInfinity
x < 0 但不 NegativeInfinity 是; 不 y 是整數、 NegativeInfinity 或 PositiveInfinity 。	NaN
x =-1; y = NegativeInfinity 或 PositiveInfinity 。	NaN
-1 < x < 1; y = NegativeInfinity 。	PositiveInfinity
-1 < x < 1; y = PositiveInfinity 。	0
x <-1 或x> 1; y = NegativeInfinity.	0
x <-1 或x> 1; y = PositiveInfinity.	PositiveInfinity
x = 0; y < 0.	PositiveInfinity
x = 0; y > 0。	0
x = 1; y 是除了以外的任何值 NaN 。	1
x = PositiveInfinity; y < 0。	0
x = PositiveInfinity; y > 0。	PositiveInfinity

這個方法會呼叫基礎 C 執行時間，而且確切的結果或有效輸入範圍在不同的作業系統或架構之間可能不同。

另請參閱

• Sqrt(Double)