Multilevel Inheritance

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Hello folks....!!!!

Today let us continue with the concept of inheritance's other types.

Multilevel inheritance

• A new class that inherits a derived class exhibits multilevel inheritance.
• For example class B inherits class A, class C inherits B. Now class C has access to the elements of class A and B as its parent B has been derived from class A.
• Let us consider the same example we considered yesterday. The record creation for an organization. For reference look at this post. 

The base class is as given below :

Then the child class employee derives the base class person. 

Next a class named manager inherits the class employee.

Now the class manager has access to the attributes and functions of the classes person and employee.

Now the relationship between this classes can be thought of as a manager is an employee and an employee is a person. So by transitivity a manager is a person. Thus one object created for the manager class can be used to call the functions in other classes also. 

To avoid too many function call as given above one can follow class composition by calling the constructors and functions of another class inside their functions. Thus the class employee can be modified as given below.

The manager class also requires slight modifications which is given below.

Now the number of function calls can be reduced. But the output remains the same. 

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