Private Sub Command1Click()

Dim a(1 To 4) As Integer

Dim i As Integer

   a(1) = 1

 For i = 2 To 4

   a(i) = 2 * a(i - 1) + 1

 Next i

List1.AddItem Str(a(i))

End Sub

Private Function f(x As Single, n As Integer) As Single

  If n ＝0 Then

    f ＝1

  Else

    If n Mod 2 ＝1 Then

      f＝x * f(x, n\2)

    Else

      f＝f(x, n\2) \x

    End If

  End If

End Function

Private Sub Command1_Click()

  Label1.Caption＝Str(f(4, 6))

End Sub

程序运行时，单击按钮Command1，标签Label1显示的内容是（  ）

Private Sub Command1_Click()

Label1.Caption = sj  ‘计算机随机产生一个值

Label2.Caption = Command1.Caption

If cp(Label1.Caption, Label2.Caption) Then ‘判断胜负

    {#blank#}1{#/blank#} = "乙方负"

Else

    Label3.Caption = "乙方胜"

End If

End Sub

Function sj() As String '随机生成石头、剪刀、布

   i = {#blank#}2{#/blank#}  ‘随机生成1~3任一整数

   If i = 1 Then sj = "石头"

   If i = 2 Then sj = "剪刀"

   If i = 3 Then sj = "布"

End Function

Private Sub command1_click()

   a=val(text1.text)

b=val(text2.text)

if a=b then

   text3.text=str(a)

   exit sub

end if

do while b<>0

   r=a mod b

   a=b

   b=r

loop

text3.text=str(a)

 End Sub

在text1、text2中输入30、6，则text3中的值为（  ）

执行该算法，输入n的值为13，下列说法正确的是(    )