C++ | Inheritance | Question 12

#include<iostream>
using namespace std;

class Base
{
protected:
    int a;
public:
    Base() {a = 0;}
};

class Derived1:  public Base
{
public:
    int c;
};


class Derived2:  public Base
{
public:
    int c;
};

class DerivedDerived: public Derived1, public Derived2
{
public:
    void show()  {   cout << a;  }
};

int main(void)
{
    DerivedDerived d;
    d.show();
    return 0;
}