问题 单项选择题

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
Private 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—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( )o

A) 输出0
B) 输出25
C) 输出45
D) 无任何输出

答案

参考答案:D

解析: 本题考查的是鼠标事件,当压下鼠标左键(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。

选择题
单项选择题 A1/A2型题