OOPS - [C++ Multilevel Inheritance]

♠ Posted by Unknown in CPP Language at 03:46

Multilevel Inheritance

When a class is derived form another derived class is called multilevel inheritance. In the following figure the class A serves as a base class for the derived class B, which in turn serves as a base class for the derived class C/ the class B is known as intermediate base class since it provides a link for the inheritance between A and C. the chain ABC is known as inheritance path.

           

            class A{…………};                         //Base Class

            class B: public A{…………};       // B derived from A

            class C: public B{…………};       // C derived from B

Example:

#include<iostream.h>

#include<conio.h>

class Student //Base Class

{

 protected:

            int rno;

 public:

            void get_number(int);

            void put_number(void);

};

void Student::get_number(int a)

{ rno = a; }

void Student::put_number(void)

{

 cout<<"Roll Number :"<<rno<<endl;

}

class Test: public Student //Intermediate Base Class

{

 protected:

            int sub1;

            int sub2;

 public:

            void get_marks(int , int );

            void put_marks(void);

};

void Test::get_marks(int x, int y)

{

 sub1 = x;

 sub2 = y;

}

void Test::put_marks(void)

{

 cout<<"Subject-1 : "<<sub1<<endl;

 cout<<"Subject-2 :"<<sub2<<endl;

}

class Result: public Test //Derived Class

{

            int total;

 public:

            void display(void);

};

void Result::display(void)

{

 total = sub1 + sub2;

 put_number();

 put_marks();

 cout<<"Total : "<<total<<endl;

}

void main()

{

 clrscr();

 Result stud;

 stud.get_number(111);

 stud.get_marks(56,78);

 stud.display();

 getch();

}