Question

计算机二级VB：这道题的答案是怎么得出来的？要过程。

Answer 1

每次调用inc函数时x值都已经被赋于了新值。　第一次调用，x值是0,a值是2，调用结束，x的值就是0+2＝2。　第二次时x值是2，参数a是3,调用结束时，x的值是2+3=5.以此类推。

Answer 2

Private Sub form_load()
List1.AddItem "a0001"
End Sub

Private Sub command1_click()
t = 0
For i = 0 To List1.ListCount - 1
List1.ListIndex = i
If Text1.Text = List1.Text Then
t = 1
MsgBox "不能输入重复项，请重新输入"
Text1.Text = ""
Exit For
End If
Next i
If t = 0 Then List1.AddItem Text1.Text
Text1.Text = ""
End Sub