Arrays within a class - C++ [2/2]

Organization
The library and its hierarchy of classes is split in different files:

* <ios>, <istream>, <ostream>, <streambuf> and <iosfwd> aren't usually included directly in most C++ programs. They describe the base classes of the hierarchy and are automatically included by other header files of the library that contain derived classes.
* <iostream> declares the objects used to communicate through the standard input and output (including cin and cout).
* <fstream> defines the file stream classes (like the template basic_ifstream or the class ofstream) as well as the internal buffer objects used with these (basic_filebuf). These classes are used to manipulate files using streams.

* <sstream>: The classes defined in this file are used to manipulate string objects as if they were streams.
* <iomanip> declares some standard manipulators with parameters to be used with extraction and insertion operators to modify internal flags and formatting options.
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