Multilevel Inheritance in C++.

Multilevel Inheritance: It is the process of deriving a class from another derived class.

//Program to implement Multilevel Inheritance...

#include <iostream.h>

#include <conio.h>

class base //single base class

{

  public:

  int x;

  void getdata()

  {

    cout << "Enter value of x= "; cin >> x;

  }

};

class derive1 : public base // derived class from base class

{

  public:

  int y;

  void readdata()

  {

      cout << "\nEnter value of y= "; cin >> y;

  }

};

class derive2 : public derive1   // derived from class derive1

{

  private:

  int z;

  public:

  void indata()

  {

    cout << "\nEnter value of z= "; cin >> z;

  }

  void product()

  {

      cout << "\nProduct= " << x * y * z;

  }

};

int main()

{

     derive2 a;      //object of derived class

     a.getdata();

     a.readdata();

     a.indata();

     a.product();

     return 0;

} 

Expected Output:-

Enter value of x= 2

Enter value of y= 3

Enter value of z= 3

Product= 18

//Program to implement Multilevel Inheritance...

#include <iostream.h>

#include <conio.h>

class A

{

    public:

      void display()

      {

          cout<<"Base class content.";

      }

};

class B : public A

{

};

class C : public B

{ 

};

int main()

{

    C obj;

    obj.display();

    return 0;

}

Expected Output:-

Base class content.

//Program to implement Multilevel Inheritance...

#include <iostream.h>  

#include <conio.h>

class A  

{  

    protected:  

     int a;  

    public:  

    void get_a(int n)  

    {  

        a = n;  

    }  

};   

class B  

{  

    protected:  

    int b;  

    public:  

    void get_b(int n)  

    {  

        b = n;  

    }  

};  

class C : public A,public B  

{  

   public:  

    void display()  

    {  

        std::cout << "The value of a is : " <<a<< std::endl;  

        std::cout << "The value of b is : " <<b<< std::endl;  

        cout<<"Addition of a and b is : "<<a+b;  

    }  

};  

int main()  

{  

   C c;  

   c.get_a(10);  

   c.get_b(20);  

   c.display();  

  

    return 0;  

}  

Expected Output:-

The value of a is : 10

The value of b is : 20

Addition of a and b is : 30