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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re; Question about pointer
References: <mailman.1033947722.20213.comp.lang.ada@ada.eu.org>
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> But, right now, i don't know what is the advantage of utilisation of
> pointer in a program

  There are more than a few ways pointers are useful.  Just two are:
Dynamically allocating memory for objects of varying size and lifetime.
Linking related objects so that a procedure given one can access the other.

You really need a good book on programming (and probably more than one)
to see some of the uses, and problems, of pointers.