Answer Posted / swetcha

We use these keywords to specify access levels for member
variables, or for member functions (methods).

.Public variables, are variables that are visible to all
classes.

.Private variables, are variables that are visible only to
the class to which they belong.

.Protected variables, are variables that are visible only
to the class to which they belong, and any subclasses.


Deciding when to use private, protected, or public
variables is sometimes tricky. You need to think whether or
not an external object (or program), actually needs direct
access to the information. If you do want other objects to
access internal data, but wish to control it, you would
make it either private or protected, but provide functions
which can manipulate the data in a controlled way.

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