Object-oriented programming (OOP) allows data and functionality to be packaged together into reusable and modular units called classes. A class acts as a blueprint for creating objects that encapsulate data and functions. The four pillars of OOP are encapsulation, abstraction, inheritance, and polymorphism which allow code to be organized, reused, and flexible.

1. Object
Oriented
Programming
Yeasir Arafat Ratul; Lecturer; Department of CSE

2. Object-oriented programming (OOP) is a programming paradigm that allows
you to package together data and functionality to modify those data states,
while keeping the details hidden away. As a result, code with OOP design is
reusable, modular, and abstract. This makes it particularly useful when you
create larger programs.
Yeasir Arafat Ratul; Lecturer; Department of CSE
Object Oriented Programming

3. Class
Yeasir Arafat Ratul; Lecturer; Department of CSE
A class is a user-defined data type that we can use in our
program, and it works as an object constructor, or a
"blueprint" for creating objects. It is a way to bind the data
and its associated functions together. Class doesn’t take
any space, objects does.

4. Class
(Blue
Print)
Objects
(Real Entity)
Yeasir Arafat Ratul; Lecturer; Department of CSE

5. Objects
Yeasir Arafat Ratul; Lecturer; Department of CSE

6. Yeasir Arafat Ratul; Lecturer; Department of CSE
Four Pillars of OOP:

7. Encapsulation
Yeasir Arafat Ratul; Lecturer; Department of CSE
bundling code into a single unit where you can determine the scope of each piece of data.

8. Abstraction
Yeasir Arafat Ratul; Lecturer; Department of CSE
“shows” only essential attributes and “hides” unnecessary information.

9. Inheritance
Yeasir Arafat Ratul; Lecturer; Department of CSE
inheriting attributes and behaviors from another class, you are able to reuse more code.

10. Inheritance
Yeasir Arafat Ratul; Lecturer; Department of CSE

11. Polymorphism
Yeasir Arafat Ratul; Lecturer; Department of CSE
the ability of a variable, function, or object to take on multiple forms.

12. Thank You
Yeasir Arafat Ratul; Lecturer; Department of CSE