Why don't we declare main function prior to it's calling in c++ ?

Question

If we need to declare every function before it's use then why not main function in c++?
Why is it so special

Answer 1

The declaration of main() is fixed inside the compiler. As for why it is so 'special', it plays a huge role in program execution - it has to exist and hence is pre-declared for programmers to define main() contents.

https://www.hackerearth.com/practice/notes/is-main-function-a-built-in-function-or-user-defined-function/