tut45.cpp

// Code Example Demonstrating Virtual Base Class in C++

#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(){
            cout<<"Your roll no is "<<roll_no<<endl;
        }
};

class Test : virtual public Student{
    protected:
        float maths , physics;
    public:
        void set_marks(float m1 , float m2){
            maths = m1;
            physics = m2;
        } 

        void print_marks(void){
            cout<<"Your result is here : "<<endl
                <<" Maths : "<<maths<<endl
                <<" physics : "<<physics<<endl;
        }
};

class Sports : public virtual Student{
    protected:
        float score;
    public:
        void set_score(float sc){
            score = sc;
        }
        void print_score(){
            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;
}