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 cin                  Log Stream


        In C++, clog is used to log a stream, and it corresponds to
    stdout. You can work with clog like this: clog<<x, where x is a
    data type or object, and << is the overloaded left shift operator,
    also called the insertion operator in C++. Note that clog is also
    an alias for ostream_withassign, and that it is a buffered form of
    cerr.

    Note:   You can also chain the use of << and >> like this:
            clog << "This is the value of x:" << x << "\n"; You do not
            need to worry about the type of the arguments you pass
            -- the << and >> operators are overloaded to handle all
            standard types, and you can even overload them for your own
            types.

            In addition, you can format log output with the clog.setf()
            member function -- see Formatting for more details.