1.How would you set up a multiple file application that had five classes?
2.What is meant by a parameterized manipulator?
3.Why should you write a virtual destructor?
4.What does "return by reference" mean, and when can you return a local variable by reference?
in fact ,I am not clear what 1 and 2 means?
and 4 means pass function's parameter by reference?????
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