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Multilevel inheritance in C++

Onyejiaku Theophilus Chidalu

Overview

Multilevel inheritance in C++ is a scenario whereby a class is derived from a particular class, which is already derived from another class.

Note: To understand inheritance in C++ click on this shot.

The figure below shows the visual representation of multilevel inheritance in C++:

Visual representation of multi-level inheritance

Example

In the code below, we derive a class son from another class father which is derived from a parent class grandfather :

#include <iostream>
using namespace std;


// creating a parent class
class Grandfather{    // this is the parent class
    public:           // this is the access specifier
    void myfunction() {
        cout<<"Gramdfather is the parent class. \nFather is derived from the Grandfather. \nAnd Son is derived from Father.";
    }
};

// deriving a class from the parent class
class Father: public Grandfather {
};

// deriving anogther class from the derived class above
class Son: public Father {  
};

int main(){
Son myobject;            // this is an object of the class
myobject.myfunction();   // calling the function 
return 0;
}
Creating a multilevel inheritance

Explanation

  • Line 6: We create a parent class Grandfather.
  • Line 7: We make the member or attribute of the class public by using the public keyword.
  • Line 8: We create a function for the myfunction class.
  • Line 9: We create a block of code to execute when we call the myfunction function.
  • Line 14: We derive a class Father from the parent class Grandfather.
  • Line 18: We derive another class Son from the derived class Father.
  • Line 22: We create an object (myobject)of the class (Son).
  • Line 23: We call the function (myfunction).

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Onyejiaku Theophilus Chidalu
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