The document discusses inheritance in C++. Inheritance allows a derived class to inherit attributes and behaviors from a base class. This establishes an "is-a" relationship where the derived class is a specialized form of the base class. There are different types of inheritance including single inheritance, multilevel inheritance, multiple inheritance, and hierarchical inheritance. Inheritance provides benefits like code reuse and extending existing functionality while maintaining relationships between classes.

1. NAME: R.PRASHANTHAN
CLASS: 1ST YEAR B.Ed. ‘B’
ROLL.NO: 54
SUBJECT: COMPUTER SCIENCE
TOPIC: INHERITANCE

2. INHERITANCE
 The mechanism
of deriving a new
class from an old
one is called
Inheritance.
 The new class is
a specialized
version of the
existing class

3. C++ and inheritance
Base Class (or superclass): the class being
inherited from
Derived Class (or subclass): the class that
inherits

4. The "is a" Relationship
 Inheritance establishes an "is a" relationship
between classes.
 A poodle is a dog
 A car is a vehicle
 A flower is a plant
 A football player is an athlete

5. Need for Inheritance
Capability of inheriting features.
Transitive relationship.
Reusability of class.

6. Advantages of inheritance
When a class inherits from another class, there are
three benefits:
(1) You can reuse the methods and data of the
existing class.
(2) You can extend the existing class by adding
new data and new methods.
(3) You can modify the existing class by
overloading its methods with your own
implementations.

7. Benefits of Inheritance
 Code is reused
grad_student uses tested code from student
 Reflects relationship in problem domain
Special grouping grad_ student outgrowth of real
world and treatment of this group
 Polymorphic mechanisms allow client code to treat
inherited class as subtype of base class
Simplifies code, maintains subtype distinctions ##

8. Raj
Father
Rani Roshan
Base Class
Derived Class
Existing
class is
called Base
Class.
New class is called
derived class.

9. INHERITANCE
SINGLE INHERITANCE
MULTIPLE INHERITANCE
MULTILEVEL
INHERITANCE
HIERARCHICAL
INHERITANCE
HYBRID INHERITANCE

10. When a subclass inherit only from one base class,it is known as
single inheritance.
Super Class
Derived Class
Super Class
(Base Class)
Sub Class
(Derived Class)

11. Syntax:
Class Derived-class : Mode base-class
{
St1;
St2;
};
Colon gives that derived class-name is
derived from base-class.
Mode is either private or public.By
default mode is private

12. Base Class & Derived Class
The new class is called Derived Class and old one is called Base class.
Class Student
{
Public: int Roll;
};
Class Ipstudent : public Student
{
Private : int ipmarks;
Public : void info( )
{ cout<< Roll;
cout<<ipmarks;
}
};
Main( )
{ ipstudent ip;
ip.Roll=1;
Ip.info( );
}

13. When many subclasses inherit from a single base class ,it
is known as hierarchical inheritance.

14. Syntax:
Class Base-class : Mode Derived-class 1,Mode Derived-class 2
{
St1;
St2;
};
Mode is either private or public.By
default mode is private
Name of different Derived-class

15. Super Class
Sub Class 2
Sub Class 1
When a subclass inherits from a class that itself
inherits from another class it is known as
multilevel inheritance.

16. When one subclass inheriting from many base class ,it is
known as hierarchical inheritance. Syntax:

17. Syntax:
Class Derived-class : Mode base-class1,Mode base-class2
{
St1;
St2;
};
Mode is either private or public.By
default mode is private
Name of different base class

18. When a subclass inherits from multiple base classes and all of its base
classes inherit from a single base class,this form of inheritance is
known as hybrid inheritance..

19. Virtual Inheritance
The derived class AutoBoat…
Inherits Attributes and Properties
From
Automobile
MotorBoat
Vehicle

20. Public, Private, and Protected Inheritance

21. Visibility Mode
 Private When base class is privately accessed by
derived class then
 Public member Private
 Protected member Private
 Private member Not inherited
Base Class Derived Class
become

22. Visibility Mode
 Public When base class is publicly accessed by
derived class then
• Private member Not inherited
• Public member Public
• Protected member Protected
Base Class Derived Class

23. Visibility Mode
 Protected When base class is accessed protectly
by derived class then
 Private member Not inherited
 Public member Public
 Protected member Protected
Base Class Derived Class

24. The significance of visibility modes
Private :-When the derived class require to use
some attributes of the base class and these inherited
features are intended not to be inherited further .
Public :-When the situation wants the derived class
to have all the attributes of the base class,plus some
extra attributes.
Protected:- When the features are required to be
hidden from the outside world and at same time
required to be inheritable.

25. Accessibility of base class member
Access
Specifier
Accessible
from own class
Accessible from
derived
class(inheritable)
Accessible from
object outside
class
Public Yes Yes Yes
Protected Yes Yes No
Private Yes No No