Since the beginning of this book you have been using the C++ I/O system, but you have been doing so
without much formal explanation. Since the I/O system is based upon a hierarchy of classes, it was not
possible to present its theory and details without first discussing classes and inheritance. Now it is time
to examine the C++ I/O system in detail. The C++ I/O system is quite large, and it won’t be possible to
discuss here every class, function, or feature, but this module will introduce you to the most important
and commonly used parts. Specifically, it shows...