Multi-level Inheritance in C++

 #include <bits/stdc++.h>

using namespace std;

class A

{

    int rollno;

public:

    void set_roll(int r)

    {

        rollno = r;

    }

    void get_roll()

    {

        cout << "The Roll No is: " << rollno << endl;

    }

};

class B : public A

{

  protected:

    float math;

    float programming;

public:

    void set_data(float m, float p)

    {

        math = m;

        programming = p;

    }

    void get_data()

    {

        cout << "The Marks of Math are: " << math << endl;

        cout << "The Marks of Programming are: " << programming << endl;

    }

};

class C : public B

{

protected:

    float per;

public:

    void display();

};

void C ::display()

{

    get_roll();

    get_data();

    cout << "You got: " << (math + programming) / 2 << "%" << endl;

}

int main()

{

    C i;

    i.set_roll(4025);

    i.set_data(89.3, 76.3);

    i.display();

    return 0;

}