未分类题

假定有以下两个过程： Sub S1(ByVal x As Integer, ByVal y As Integer) Dim t As Integer t=K x=y y=t End Sub Sub S2(x As Integer, y As Integer) Dim t As Integer t=K x=y y=t End Sub 则以下说法中正确的是 ( )
D.用过程S1和S2都不能实现交换两个变量值的操作

A.用过程S1可以实现交换两个变量值的操作，S2不能实现
B.用过程S2可以实现交换两个变量值的操作，S1不能实现
C.用过程S1和S2都可以实现交换两个变量值的操作

【参考答案】

B
解析：本题主要是对调用方式的考查。在S1中实现的是传值调用，故不影响实际参数值。S2过程中实现的是传址调用，影响到实际参数。故用过程S2可以实现两个变量值的操作，而S1不能实现。选项B正确。
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