Multilevel Inheritance - C++ OOP's Concept Tutorial

Tutorials

Cpp

Topic

What is "Multilevel Inheritance" OOP's concept in C++?

Explanation

Multilevel Inheritance is a method where a derived class is derived from another derived class.

Example:

#include <iostream.h>
class mm
  {
    protected:
      int rollno;
    public:
      void get_num(int a)
        { rollno = a; }
      void put_num()
        { cout << "Roll Number Is:\n"<< rollno << "\n"; }
  };
class marks : public mm
  {
    protected:
      int sub1;
      int sub2;
    public:
      void get_marks(int x,int y)
        {
           sub1 = x;
           sub2 = y;
        }
      void put_marks(void)
        {
          cout << "Subject 1:" << sub1 << "\n";
          cout << "Subject 2:" << sub2 << "\n";
        }
   };
class res : public marks
   {
     protected: 
       float tot;
     public:
       void disp(void)
          {
            tot = sub1+sub2;
            put_num();
            put_marks();
            cout << "Total:"<< tot;
          }
   };
int main()
   {
     res std1;
     std1.get_num(5);
     std1.get_marks(10,20);
     std1.disp();
     return 0;
  }

Result:

   Roll Number Is:
   5
   Subject 1: 10
   Subject 2: 20
   Total: 30

In the above example, the derived function "res" uses the function "put_num()" from another derived class "marks", which just a level above. This is the multilevel inheritance OOP's concept in C++.

Multilevel Inheritance - OOP's Concept