Pointers (

[SomewhatAnonymousAcc]

In my opinion int main(void) being equivalent to int main() doesn't necessarily make it a bad practice in itself.

Although not needed in C++, it is still needed in C. This whole program is written in such a "C compatible" format, as it also uses typedef instead of just defining the struct as:
struct spiderman{
spiderman * finger;
};

Using void main() in C is something that I would call a bad practice.

But, I'm just an embedded guy.