It is possible to place a class defi nition within another class defi nition. This is called nested class . The nested
class is a valuable feature because it allows the programmer to group classes that logically belong together and
to control the visibility of one within the other. The scope of nested class is limited to the scope of the class in
which it is nested. For example, if class In is defi ned inside the class Out, In will be known to Out class only,
but the reverse is not true. Class In can access all the members of the Out class directly regardless of their type:
be it
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