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Tamilnadu 11th Standard Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set B

11th Standard English Medium Computer Science Subject Inheritance Book Back 3 Mark Questions with Solution updated Book back Questions

Published on: 13/05/2022

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Std: 11th Standard - Computer Science

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Questions:

Generic 3

5 x 3 = 15

Write some facts about the execution of constructors and destructors in inheritance.

What do you mean by overriding?

What is the difference between polymorphism and inheritance though are used for reusability of code?

What is difference between the members present in the private visibility mode and the members present in the public visibility mode

What are the points to be noted while deriving a new class?

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Answers Key:

Generic 3

5 x 3 = 15

Some Facts About the execution of constructor in inheritance
i. Base class constructors are executed first, before the derived class constructors execution
ii. Derived class cannot inherit the base class constructor but it can call the base class constructor by using Base_class name::base_class_constructor() in derived class definition
iii. If there are multiple base classes, then its start executing from the left most base class
iv. In multilevel inheritance, the constructors will be executed in the order of inheritance The destructors are executed in the reverse order of inheritance.

When a derived class member function has the same name as that of its base class member function, the derived class member function shadows/hides the base class's inherited function. This situation is called function overriding.

Polymorphism	Inheritance
Reusability of code is implemented through functions (or) methods.	Reusability of code is implemented through classes.
Polymorphism is the ability of a function to respond differently to different message.	Inheritance is the process of creating derived classes from the base class or classes.
Polymorphism is achieved through overloading.	Inheritance is achieved by various types of inheritances namely single, multiple, multilevel, hybrid and hierarchical inheritances.

Members present in the private visibility mode	Members present in the public visibility mode
Can be accessed only by the class members.	Can be accessed by the outside members also.
By default the members will be in private visibility mode.	Members, to be in public visibility mode has to be specified explicitly.
When classes are inherited, private members are not inherited.	When classes are inherited, the public members are inherited as private, protected and public members of the derived class.

The following points should be observed for defining the derived class:
(i) The keyword class has to be used.
(ii) The name of the derived class is to be given after the keyword class.
(iii) A single colon.
(iv) The type of derivation (the visibility mode), namely private, public or protected. If no visibility mode is specified, then by default the visibility mode is considered as private.
(v) The names of all base classes (parent classes) separated by comma.