[_kst_]

The "any amount of arguments you want" applies to C function call. The mechanism for invoking your "main" function might use a different mechanism.

The C standard specifies (for hosted implementations) two ways to define "main", and allows implementations to document and support more. "int main(void)" is one of them. "int main()" is not. So, strictly speaking, using "int main()" makes your program's behavior undefined.

On the other hand, as far as I know every implementation actually allows "int main()" with no problem. This was necessary to support pre-ANSI C code, which couldn't use the "void" keyword. It's still better to be explicit and use "int main(void)" rather than "int main()". (It can also affect recursive calls to main, which are legal but almost certainly a bad idea.)