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First, assume that you have moved to the newly created do_analysis
function the declarations and statements in the version of main in
Segment 627. Some details need to be added to do_analysis,
to be sure; for the moment, however, concentrate on what you need to do to
obtain a file name in the new version of main.
Recall that the program, as it stands, defines input_buffer to be a
character array. Accordingly, you can have the program insert a file name
into that array:
cin >> input_buffer;
Then, once the program has a file name, you can have it attempt to open the corresponding file:
ifstream car_stream (input_buffer);