单项选择题

单击命令按钮时，下列程度段的执行结果为( )。
Pfivate Sub Command1_Click()
Dima As Integer，b As Integer, c As Integer
a=2:b=4:c=6
Call S1(a，b)
Print "a="；a；"b="；b；"c="；c
Call S2(a，b)
Print "a="；a；"b="；b；"c="；c；
End Sub
Private Sub S1(x As Integer, y As Integer)
Dim c As Integer
x=2*x:y=y+2:c=x+y
End Sub
Sub S2(x As Integer, By Val y As Integer)
Dim e As Integer
x=2*x:y=y+2:e=x+y
End Sub

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