inheritance

 #include <iostream>

using namespace std;

class base

{

protected:

    int num1, num2;

public:

    base() {}

    base(int num1, int num2)

    {

        this->num1 = num1;

        this->num2 = num2;

    }

    virtual void printdata()

    {

        cout << num1 << " and " << num2 << endl;

    }

};

class child : virtual public base

{

    int num3;

public:

    child() {}

    child(int num3, int num2, int num1) : base(num1, num2)

    {

        this->num3 = num3;

    }

    void printdata()

    {

        cout << "num3 and base class nums are " << num3 << " " << num1 << " " << num2 << endl;

    }

};

class derived : virtual public base

{

};

class new4 : public child, public derived

{

};

int main()

{

    base *ptr, obj1(2, 3);

    ptr = &obj1;

    ptr->printdata();

    child obj(4, 5, 6);

    ptr = &obj;

    ptr->printdata();

    return 0;

}