[单项选择]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，将显示一个输入对话框，如果在输入对话框中输入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
