8.1. The IO Classes
The IO types and objects that we’ve used so far manipulate char data. By default these objects are connected to the user’s console window. Of course, real programs cannot be limited to doing IO solely to or from a console window. Programs often need to read or write named files. Moreover, it can be convenient to use IO operations to process the characters in a string. Applications also may have to read and write languages that require wide-character support.
To support these different kinds of IO processing, the library defines a collection of IO types in addition to the istream and ostream types that we have already used. ...
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