I see nothing wrong with his main() -- argc and argv parameters are optional.
I guess he's talking about empty parameter lists being deprecated in C. And old C headers are deprecated in C++ so that program is somewhere in between C and C++.
But let's be serious and remember that the chances of either of those causing a problem are vanishingly small.
In C, when a function defination or declaration is followed by an empty pair of parentheses it means that zero or more parameters. So main when written as int main( ) in C can stand for int main( int, int, int ) or int main( void, void ) or whatever, whereas the standard specifically says that the prototype of main can only be either int main( void ) or int main( int argc, char** argv ). Hence the explicit void is required in case of pure C programs.
Whereas in C++ when a function defination or declaration is followed by an empty pair of parentheses it means it does not take any argument i.e. void. Hence the void can be safely omitted in C++.
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