Private Sub Command1_Click()

        Dim  N  As  Integer

        Dim  S  As  Integer

        N = val(Text1.Text)    

        S = 0

          For i = 1 To N

             S = S +  i * (i + 1)

          Next i

        Text2.Text = str(S)

End Sub

Dim data(10) As Integer     ‘①

Dim n As Integer     ‘n表示总元素个数

Private Sub Command1_Click()

 Dim t As Integer

 t = Val(Text1.Text)

 For i = t To n-1

   ② 

 Next i

 n = n - 1

 For i = 1 To n

   ③ 

 Next i

End Sub

Private Sub Form_Load()

Dim i As Integer

n = 10

For i = 1 To n

  data(i) = i * 2

  List1.AddItem Str(data(i))

Next i

End Sub