> ac>   int main(void)

 > I have only started programming in C so I haven't used that can you
 > tell me the advantages of that compared to "void main()"

"void main()" does not conform with the ISO standard. Put simply,
it still 'works' with most (all?) compilers, but there is no guarantee that
any conforming implementation need do so or will. "void main()"
is often used in books which were written prior 1989 (when ANSI-C became
standard) or written by folks who learned C before 1989.

Using "void main()" is regarded as poor practice to do so, but
not as bad as a  zillion other things you can do wrong, such as writing
code whose result depends on the order of evaluation of arguments in an
expression etc.

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