. Private Sub Command1_Click()
Dim a%, b%
a = 50: b = 100
Print "调用前", "A="; a, "B="; b
swap a, b
Print "调用后"; "A="; a, "B="; b
End Sub
Private Sub swap(ByVal x%, y%)
Dim t%
t = x: x = y: y = t
End Sub
结果是：调用前A=50,B=100
调用后A=50,B=50
结果为什么是这样的？形参、实参怎么回事？值传递、地址传递怎么回事？
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