在窗体上画一个名称为Command1的命令按钮和3个名称为Label1、Label2、Label3的标签,然后编写如下程序段:
Private x As Integer
Private Sub Command1_Click( )
Static y As Integer
Dim z As Integer
n =10
z = n+z
y=y+z
x=x+z
Label1. Caption = x
Label2. Caption = y
Label3. Caption = z
End Sub
运行程序,连续3次单击命令按钮后,则3个标签中显示的内容是( )。
A.10 10 10
B.30 30 30
C.30 30 10
D.10 30 30