窗体上有一个名称为Command1的命令按钮,其单击事件过程如下: Private Sub Command1_Click() Dim x As Integer,Y As Integer Static z As Integer x=3:Y=5:z=y Cal

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问题 窗体上有一个名称为Command1的命令按钮,其单击事件过程如下:
Private Sub Command1_Click()
Dim x As Integer,Y As Integer
Static z As Integer
x=3:Y=5:z=y
Call f(x,y,z)
Print x;y;z
End Sub
Private Sub f(ByVa la As Integer,ByRef b As Integer, c As Integer)
a=a+a:b=b+b:c=c+c
End Sub
运行程序,单击命令按钮时,3个标签中显示的内容分别是

选项 A、3 5 5
B、3 5 10
C、3 10 5
D、3 10 10

答案D

解析 f(ByVal a As Integer,ByRef b As Integer,c As Integer)函数中a是值传递,b地址传递,c缺省为地址传递。值传递使用两个存储单元,地址传递使用同一个存储单元,会改变变量的值。选D。
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