[填空题] 编写如下代码： Dim Flag As Boolean Private Sub Form MouseDown (Button As Integer,
2021-07-20
[填空题] 编写如下代码： Dim Flag As Boolean Private Sub Form MouseDown (Button As Integer, Shift As Integer, X As Single, Y As Single) Flag = True End Sub Private Sub Form MouseMove (Button As Integer, Shift As Integer, X As Single, Y As Single) Flag = False End Sub Private Sub Form_ MouseUp (Button As Integer,Shift As Integer, X As Single, Y As Single) If Flag = False ThenPrint "DDDD" End If End Sub程序运行后，如果想在窗体上输出DDDD，则应执行的操作为______ 。
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