Diamond Inheritance Lowest Base Class Constructor

Question

The Code is as follow :

The Code :

#include 

using namespace std;

class Animal{
   int a;

    public:
    Animal(i         


        

Answer 1

The most derived class initializes any virtual base classes. In your class hierarchy, Unknown must construct the virtual Animal base class (e.g. by adding Animal(a) to its initialization list).

When constructing an Unknown object, neither Fish nor Bird will call the Animal constructor. Unknown will call the constructor for the Animal virtual base.