Student.cpp

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

class Student
{
public:
  void getData() {
		cout << "Enter your roll number: " << endl;
		cin >> rollNo;

		cout << "Enter your full name: " << endl;
		cin >> name;
	}

private:
	int rollNo;
	string name;
};
class Marks : public Student
{

public:
	void getMarks() {
		cout << "Enter your marks of 1st Subject: " << endl;
		cin >> m1;

		cout << "Enter your marks of 2nd Subject: " << endl;
		cin >> m2;

		cout << "Enter your marks of 3rd Subject: " << endl;
		cin >> m3;
	}

	void display() {
		percentage = ((m1 + m2 + m3) / 300.0) * 100.0;
		cout << "Your percentage is: " << percentage << endl;
	}

private:
	int m1, m2, m3;
	double percentage;
};

int main()
{
	Marks s1;

	s1.getData();
	s1.getMarks();
	s1.display();

	system("pause");
	return 0;
}