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- The member function print() produces a complete listing of the
- contents of the telephone book. The client code specifies the
- output stream that is the destination of the listing in the
- argument "os". The identifier "ostream" is defined in the header
- file "iostream.h". The return value from print() is also a
- reference to the output stream. This is a common technique in
- C++. It is demonstrated later in this example.
-