单项选择题

单击命令按钮时,下列程序的执行结果为( )。   Private Sub Command1_Click()     Dim x As Integer,y As Integer     x=50:y=78     Call PPP(x,y)     Print x;y   End Sub   Public Sub PPP(ByVal n As Integer,ByValm As Integer)     n=n\10     m=m\10   End Sub

A. 多态
B. 继承
C. 封装
D. 垃圾回收