Virtual Class in C++

 

#include<bits/stdc++.h>

using namespace std;

class A{

    protected:

    int roll;

    public:

    void set_roll(int r){

        roll=r;

    }

    void print_roll(){

       

        cout<<"The Roll No. is: "<<roll<<endl;

    }

};

class B: virtual public A{

    protected:

    double math;

    double english;

    public:

    void set_marks(double m, double e){

        math=m;

        english=e;

    }

    void print_marks(){

       

        cout<<"The Marks in Math: "<<math<<endl;

        cout<<"The Marks in English: "<<english<<endl;

    }

};

class C: virtual public A{

    protected:

    double score;

    public:

    void set_score(double s){

        score=s;

    }

    void print_score(){

       

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

    }

};

class D: public B, public C{

    public:

    void display(){

        print_roll();

        print_marks();

        print_score();

        cout<<"Total Marks obtaiend is: "<<math+english+score<<endl;

        cout<<"Your Got total: "<<(math+english+score)/3<<"%"<<endl;

    }

};

int main()

{

    D i;

    i.set_roll(4025);

    i.set_marks(75,86.0);

    i.set_score(69);

    i.display();

    return 0;

}