[1]

或更精確的

下面是分別用vb.net編寫的普通的方式和上面這個近似計算的方式計算出來的結果

Imports System.Math

Public Class Form1

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

Dim n As Double = TextBox1.Text

Dim result As Double = 1

For i As Double = n To 2 Step -1

result = result * i

Next

TextBox2.Text = result.ToString

Const pai As Double = 3.14159265358

Const ee As Double = 2.718281828459

TextBox3.Text = Sqrt(2 * pai) * (n ^ (n + 1 / 2)) * (ee ^ (-n))

End Sub

End Class

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