用VB.Net自定義過程，求階乘！

Private Function a%(b)

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s = 1

For i = 1 To b

s = s * i

Next i

a = s

End Function

Private Sub Form_activate()

For i = 1 To 10

n = n + a(i)

Next i

Print n

End Sub

VB.NET 怎樣編寫使用Do While 循環(huán)輸出1-10的階乘，我是新手請加上文字說明，呵呵，謝謝各位了！

首先在窗體上畫兩個控件：TextBox1和Button1

TextBox1用來輸入需要計算那個數(shù)的階乘

雙擊Button1進(jìn)入輸入代碼，代碼如下

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

Try

Dim Factorial As Integer = 1 '定義一個變量用來記錄階乘的結(jié)果

Dim count As Integer '定義一個變量用來記錄需要計算那個數(shù)的階乘

Dim i As Integer = 1 '定義一個數(shù)用來循環(huán)

count = Int(Val(Me.TextBox1.Text)) '把TextBox1的值賦值給count

Do While i = count '下面開始計算階乘

Factorial = Factorial * i '計算階乘

i += 1 '自增1

Loop

MessageBox.Show(Int(Val(Me.TextBox1.Text)) "的階乘是：" Factorial, "完成", MessageBoxButtons.OK) '彈出計算結(jié)果

Catch ex As Exception '出錯提示

MessageBox.Show(Err.Description, "出錯了", MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try

End Sub

用VB.NET編寫一個程序 ：編一求階乘的函數(shù)f(n),主調(diào)程序求組合數(shù)的程序，分別調(diào)用f(n),用來計算組合數(shù)的值

Private Sub Command1_Click()

Dim A, B, C

A = 10

B = 3

C = f(A) / (f(B) * f(A - B))

Print C

End Sub

Private Function f(n)

Dim I As Integer

f = 1

For I = 1 To n

f = f * I

Next I

End Function