下列代码处CallFact（m，fac）显示我ByRef参数类型不符，请问，我如何改正呢？

1。改Public Sub fact(x As Integer, p As Integer)为Public Sub fact(x As Integer, p As Long)你的 Call fact(n, fac)中fac为Long，所以函数也要Long2.改 c = c / fact为 c = c / fac你的fact是函数，要参数的