在窗体上画一个名称为Command1的命令按钮,然后编写如下程序: Dim SW As Boolean Function func(X As Integer) As Integer If X<20 Then Y=X Else Y=20+X End If f

admin2010-11-20  32

问题 在窗体上画一个名称为Command1的命令按钮,然后编写如下程序:
Dim SW As Boolean
Function func(X As Integer) As Integer
If X<20 Then
Y=X
Else
Y=20+X
End If
func=Y
End Function
Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)
SW=False
End Sub
Pdvate Sub Form_MouseUp(Button As Integer,Shift As Integer,X As Single,Y As Single)
SW=True
End Sub
Private Sub Command1_Click()
Dim intNum As Integer
intNum=InputBox("")
If SW Then
Print func(intNum)
End If
End Sub
程序运行后,单击命令按钮,将显示一个输入对话框,如果在对话框中输入25,则程序的执行结果为

选项 A、输出0
B、输出25
C、输出45
D、无任何输出

答案C

解析 本题考查的是鼠标事件,当按下鼠标左键(发生MouseDown时),SW的值为False,当松开鼠标左键(触发MouseUp时),SW的值为True。
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