Hi everyone!.How to fix this error C2504?

Question

(File mo.h)
class mo
{
public:
mo()
{

cout<<"constructor"<<endl;
}

~mo()
{

cout<<"destructor"<<endl;
}
};

(File d.h)
class d: public mo{
public:
};

Int main()
{

}
(It does not work with files)

Answer 1

The only errors I can see in your code are
1) nothing in main()
2) constructor and destructor of class mo are private ( edit : it have been fixed now )

Here is the fix👇
https://code.sololearn.com/c5FZPzKWlry3/?ref=app

Answer 2

Ohh sorry

Answer 3

In my computer was different ill fix