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 Sub Command1 click( )

  Dim a(1 to 3) as integer,k as integer,t as integer,s as integer

  a(1)=15: a(2)=36: a(3)=7

  s=0

  For k=2 to 3

if a(k)>a(1) then

  t=a(1):a(1)=a(k):a(k)=t

  s=s+1

End if

  Next k

  text1.text=str(a(1))

  text2.text=str(s)

End sub

用VB软件设计的自摘收费程序，功能如下：在文本框Textl中输入自摘的人数n，在文本框Text2中输入摘得桔子重量w。界面右上方是小游戏部分，程序在文本框Text3显示随机产生的桔子层数m，根据图中所示的堆桔子方法（第1层1个；第2层4个；第3层9个……），请顾客计算出m层桔子总数s，输入到文本框Text4中，单击“是否优惠计算”按钮Command1，就会在标签Label4中输出最后的费用f，并在标签Label7中给出提示是否“优惠后的费用”。运行效果如图所示： 

Private Sub Command1_Click()

x = Text1.Text

n = Len(x)

s=s+Mid(x,1,1)

For i = 2 To n

flag =0

For j = 1 To Len(s)

If  Then '{#blank#}1{#/blank#}

flag = 1: Exit For

End If

Next j

If  Then '{#blank#}2{#/blank#}

s = s + Mid(x, i, 1)

End If

Next i

Text2.Text = s

End Sub

五行程序代码中有{#blank#}1{#/blank#}处错误，在对应的横线上修改