在窗体上画一个名称为Commana1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 Commandl_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

A．输出0

B．输出25

C．输出45

D．无任何输出