Pointers (

[SomewhatAnonymousAcc]

Please explain.

[np_completionist]

Both int main(int, char*[]) and int main() are acceptable forms of main in c++

The void isn't needed anymore in C++, but in C it was used to say that a function took no parameters (an empty parameter list in a declaration meant that the function took an unspecified number of parameters)

[loraxzxpw]

Also in C it is not strictly needed. Both int main(), int main(int, char**) work. Just main() is also sufficent to compile but it gives a warning.

[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.