Could you explain why the output of the code is nothing. My understanding is that "A a()" calls the "A(int a)..." function but f

Question

#include <iostream>
using namespace std;
class A{
public:
A(){cout<<"It's A class";}
A(int a){cout<<"A";}
};
int main()
{
A a();
return 0;
}

Answer 1

A a(); actually creates a function called a with no body.
A a; is all you would need to call the default parameterless constructor.

https://stackoverflow.com/questions/5300124/calling-the-default-constructor