Default constructor c++

Question

I am trying to understand how default constructor (provided by the compiler if you do not write one) versus your own default constructor works.

So for example I wrot

Answer 1

A n();

could be parsed as an object definition with an empty initializer or a function declaration.

The language standard specifies that the ambiguity is always resolved in favour of the function declaration (§8.5.8).

So n is a function without arguments returning an A.