[说明]
某小型家电超市开发了下面的程序，用以实现商品提货信息的汇总和输出功能。程序的运行界面如下图所示：

程序界面包含两个控件数组，分别是提货商品复选框控件数组Check1以及提货数量文本框控件数组Text1(相同下标的复选框和文本框相对应)，提货清单的显示由List控件实现，按钮“打印清单”和“清除”分别名为Command1和Command2。
[Visual Basic代码]
’提货商品复选框的单击事件响应代码
Private Sub Check1_Click(Index As Integer)
If Check1 (Index). Value = 1 Then (1) . SetFocus
End Sub
’按钮“打印清单”的单击事件响应代码
Private Sub Command1_Click()
Dim i, n, price As Integer, sum As Long, title As String
sum = 0
For i = O To 4
Select Case i
Case 0: title ="电视机": price = 3580
Case 1: title ="微波炉": price = 660
Case 2: title ="电冰箱": price = 1850
Case 3: title ="DVD":price = 2880
Case 4: title ="空调": price = 2500
End Select
If (2) = 1 And Textl(i). Text ＜ ＞ " " Then
(3) title & Text1(i).Text & "台"
n = n + Val(Textl(i))
sum = (4)
End If
Next i
If sum ＜ ＞ 0 Then
(3) "共:" & n &"台," &"合计金额:"& sum &"元。"
End If
End Sub
’按钮“清除”的单击事件响应代码
Private Sub Command2_Click()
(5)
End Sub