单项选择题

单击命令按钮时，下列程度段的执行结果是( )。

Pdvate Sub Command1_Clik()

Dim a As Integer,b As Integer,c As Integer

a=2;b=4;c=6

CaII S1(a,b)

Print"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,ByVal y As Integer)

Dim e As Integer

x=2*x:y=y+2:e=x+y

End Sub