Inheritance-Virtual Base Class

 #include<iostream>

using namespace std;

/*

Inheritance:

student -->test [Done]

student-->sports [Done]

test --> result [Done]

sports --> result [Done]

*/

class Student{

    protected:

        int roll_no;

    public:

        void set_number(int a){

            roll_no = a;

        }

        void print_number(void){

            cout<<"Your roll no is "<< roll_no<<endl;

        }

};

class Test : public Student{

    protected:

        float maths, physics;

        public:

            void set_marks(float m1, float m2){

                maths = m1;

                physics = m2;

            }

            void print_marks(void){

                cout << "You result is here: "<<endl

                     << "Maths: "<< maths<<endl

                     << "Physics: "<< physics<<endl;

            }

};

class Sports: public Student{

    protected:

        float score;

    public:

        void set_score(float sc){

            score = sc;

        }

        void print_score(void){

            cout<<"Your PT score is "<<score<<endl;

        }

};

class Result : public Test, public Sports{

    private:

        float total;

    public:

        void display(void){

            total = maths + physics + score;

            print_number();

            print_marks();

            print_score();

            cout<< "Your total score is: "<<total<<endl;

        }

};

int main(){

    Result harry;

    harry.set_number(4200);

    harry.set_marks(78.9, 99.5);

    harry.set_score(9);

    harry.display();

    return 0;

}