未分类题

在窗体中添加一个名称为Command1的命令按钮，然后编写如下程序： Public x As Integer Private Sub Command1_Click() x=10 Call s1 Call s2 MsgBox x End Sub Private Sub sl() x=x+20 End Sub Private Sub s2() Dim x As Integer x=x+20 End Sub 窗体打开运行后，单击命令按钮，则消息框的输出结果为( )。
D.50

A.10
B.30
C.40

【参考答案】

B
解析：本题考查变量作用域的知识。在整个程序中定义了一个全局变量x，在命令按钮的单击事件中对这个x赋值为10......

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A.According
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D.
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E.
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A.A.a
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