Can in this way be declared a global object class?

Question

I do not know why but this code works, what does this record }r; and how it works ? can in this way be declared a global object class ?

#include <iostream>

class А
{
    public:
        А()
        {
            std::cout << "Hello World";
        }
}r;

int main()
{

}

Answer 1

That declares a global variable named r that is of type A.

It's the same as

class A { ... };

A r;

int main() { ... }