阅读以下说明和Visual Basic 码,将入(n)处的字名写在的对应栏内 [说明] 这是一个用户名校验程序,如用户名正确,即输出欢迎字样,否则,弹出警告窗并直接退出程序。下面是实现上述功能的程序,请填空。“Option Explicit”此语句的作用:强制显示声明 Dim UserName (2) As String Dim Flag As Boolean (1) Private Sub Form. _ Load( ) UserName (0) = 'AA': UserName (1) = 'BB': UserName(2) = 'CC' Flag = False inputName = InputBox( “请输入名称:“,”身份确认”“,”) Dim i As Integer For i = 0 To False If inputName = UserName(i) Then (2) End If Next i If (3) Then MsgBox “用户身份确失败!退出应用”, vbOKOnly, “警告” End End If End Sub Private Sub Form_ Paint( ) (4) End Sub