单项选择题下列叙述中错误的是( )。
单项选择题有下列两个过程: Sub S1(ByVal x As Integer, ByVal y As Integer) Dim t As Integer t=x x=y y=t End Sub Sub S2(x As Integer, y As Integer) Dim t As Integer t=x x=y y=t End Sub 则下列叙述中正确的是( )。