PROGRAM TO IMPLEMENT MULTILEVEL INHERITENCE

//PROGRAM TO IMPLEMENT MULTILEVEL INHERITENCE
/*MADE BY KRISHNA AGARWAL*/
#include<iostream.h>
#include<conio.h>
class student
{
    protected:
    int roll_number;
    public:
    void get_number();
    void put_number();
};
void student::get_number()
{
    int k;
    cout<<"enter the roll number\n";
    cin>>k;
    roll_number=k;
}
void student::put_number()
{
    cout<<"\nroll number = "<<roll_number<<"\n";
}
class test:public student
{
    protected:
    float sub1;
    float sub2;
    public:
    void get_marks();
    void put_marks();
};
void test::get_marks()
{
    float p,q;
    cout<<"enter the marks in two subjects\n";
    cin>>p>>q;
    sub1=p;
    sub2=q;
}
void test::put_marks()
{
    cout<<"\nmarks in sub1 is = "<<sub1<<endl;
    cout<<"marks in sub2 is = "<<sub2<<endl;
}
class result: public test
{
    float total;
    public:
    void display(void);
};
void result::display()
{
    total=sub1 + sub2;
    put_number();
    put_marks();
    cout<<"\ntotal = "<<total<<"\n";
}
//-----------------------------------------
void main()
{
    clrscr();
    result student1;
    student1.get_number();
    student1.get_marks();
    student1.display();
    getch();
}