This document provides an overview of object-oriented programming (OOP) concepts like objects, classes, abstraction, encapsulation, inheritance, and polymorphism. It also discusses OOP principles and how they are implemented in C++. Key points include: OOP aims to model real-world entities and their relationships via objects and classes; classes act as blueprints that define objects; abstraction hides unnecessary details; encapsulation bundles related data and functions; inheritance allows code reusability; and polymorphism allows one interface to work with multiple forms. The document also contrasts compile-time vs. runtime polymorphism.
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This course is a complete package that helped me to learn Python Programming from basic to an intermediate level. The course curriculum has been divided into 4 weeks where we can practice questions & attempt the assessment tests according to your own pace. The course offers us a wealth of programming challenges that will help you to prepare for interviews with top-notch companies like Microsoft, Amazon, Adobe etc
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Object-oriented programming (OOP) is the core ingredient of the .NET framework. OOP is so important that, before embarking on the road to .NET, you must understand its basic principles and terminology to write even a simple program. The fundamental idea behind OOP is to combine into a single unit both data and the methods that operate on that data; such units are called an object. All OOP languages provide mechanisms that help you implement the object-oriented model. They are encapsulation, inheritance, polymorphism and reusability. Let's now take a brief look at these concepts.
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These are the slides I was using when delivering the Python Crash Course (https://www.meetup.com/life-michael/events/247984087/). The crash course was delivered in Hebrew. More info about the Python Programming course I deliver can be found at python.course.lifemichael.com.
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2. OOPS
Object-Oriented Programming or OOPs refers to
languages that uses objects in programming.
Object-oriented programming aims to
implement real-world entities like inheritance,
hiding, polymorphism etc in programming. The
main aim of OOP is to bind together the data
and the functions that operate on them so that
no other part of the code can access this data
except that function.
3.
4. Principle of OOPS
• Object
This is the basic unit of object oriented
programming. That is both data and function that
operate on data are bundled as a unit called as
object.
• Class
When you define a class, you define a blueprint for
an object. This doesn't actually define any data, but
it does define what the class name means, that is,
what an object of the class will consist of and what
operations can be performed on such an object.
5. • Abstraction
Data abstraction refers to, providing only essential
information to the outside world and hiding their
background details, i.e., to represent the needed
information in program without presenting the details.
For example, a database system hides certain details of
how data is stored and created and maintained. Similar
way, C++ classes provides different methods to the
outside world without giving internal detail about those
methods and data.
6.
7. Encapsulation
Encapsulation is placing the data and the
functions that work on that data in the same
place. While working with procedural languages,
it is not always clear which functions work on
which variables but object-oriented
programming provides you framework to place
the data and the relevant functions together in
the same object.
8.
9. Inheritance
One of the most useful aspects of object-
oriented programming is code reusability. As the
name suggests Inheritance is the process of
forming a new class from an existing class that is
from the existing class called as base class, new
class is formed called as derived class.
This is a very important concept of object-
oriented programming since this feature helps
to reduce the code size.
10. Important terminology:Inheritance
•
Super Class: The class whose features are inherited is
known as superclass(or a base class or a parent class).
• Sub Class: The class that inherits the other class is known
as subclass(or a derived class, extended class, or child
class). The subclass can add its own fields and methods in
addition to the superclass fields and methods.
• Reusability: Inheritance supports the concept of
“reusability”, i.e. when we want to create a new class and
there is already a class that includes some of the code that
we want, we can derive our new class from the existing
class. By doing this, we are reusing the fields and methods
of the existing class.
11.
12. Polymorphism
The ability to use an operator or function in
different ways in other words giving different
meaning or functions to the operators or
functions is called polymorphism. Poly refers to
many. That is a single function or an operator
functioning in many ways different upon the
usage is called polymorphism.
13.
14. Introduction to C++
C++ is a middle-level programming language
developed by Bjarne Stroustrup starting in 1979
at Bell Labs. C++ runs on a variety of platforms,
such as Windows, Mac OS, and the various
versions of UNIX.
15. Use of C++
• C++ is used by hundreds of thousands of programmers
in essentially every application domain.
• C++ is being highly used to write device drivers and
other software that rely on direct manipulation of
hardware under realtime constraints.
• C++ is widely used for teaching and research because it
is clean enough for successful teaching of basic
concepts.
• Anyone who has used either an Apple Macintosh or a
PC running Windows has indirectly used C++ because
the primary user interfaces of these systems are
written in C++.
16. Points to NOTE
• C++ is a statically typed, compiled, general-
purpose, case-sensitive, free-form programming
language that supports procedural, object-
oriented, and generic programming.
• C++ is regarded as a middle-level language, as it
comprises a combination of both high-level and
low-level language features.
• C++ is a superset of C, and that virtually any legal
C program is a legal C++ program.
18. The word polymorphism means having many
forms. In simple words, we can define polymorphism as
the ability of a message to be displayed in more than one
form.
Real life example of polymorphism, a person at the
same time can have different characteristic. Like a lady at
the same time is a mother, a daughter, a teacher etc . So
the same person posses different behavior in different
situations. This is called polymorphism.
Polymorphism is considered as one of the important
features of Object Oriented Programming.
19.
20. • Compile time polymorphism: The overloaded
functions are invoked by matching the type
and number of arguments. This information is
available at the compile time and, therefore,
compiler selects the appropriate function at
the compile time. It is achieved by function
overloading and operator overloading which is
also known as static binding or early binding.
Now, let's consider the case where function
name and prototype is same.
21. Compile time polymorphism: This type of
polymorphism is achieved by function
overloading or operator overloading.
Function Overloading: When there are multiple
functions with same name but different
parameters then these functions are said to
be overloaded. Functions can be overloaded
by change in number of
arguments or/and change in type of arguments.
22. Operator Overloading: C++ also provide option
to overload operators. For example, we can
make the operator (‘+’) for string class to
concatenate two strings. We know that this is
the addition operator whose task is to add two
operands. So a single operator ‘+’ when placed
between integer operands , adds them and
when placed between string operands,
concatenates them.
23. • Run time polymorphism: Run time
polymorphism is achieved when the object's
method is invoked at the run time instead of
compile time. It is achieved by method
overriding which is also known as dynamic
binding or late binding.
24. Runtime polymorphism: This type of
polymorphism is achieved by Function
Overriding.Function overriding on the other
hand occurs when a derived class has a
definition for one of the member functions of
the base class. That base function is said to
be overridden.
25. Compile time polymorphism Run time polymorphism
The function to be invoked is
known at the compile time.
The function to be invoked is
known at the run time.
It is also known as overloading,
early binding and static binding.
It is also known as overriding,
Dynamic binding and late binding.
Overloading is a compile time
polymorphism where more than
one method is having the same
name but with the different
number of parameters or the type
of the parameters.
Overriding is a run time
polymorphism where more than
one method is having the same
name, number of parameters and
the type of the parameters.
It is achieved by function
overloading and operator
overloading.
It is achieved by virtual functions
and pointers.
It provides fast execution as it is
known at the compile time.
It provides slow execution as it is
known at the run time.
It is less flexible as mainly all the
things execute at the compile
time.
It is more flexible as all the things
execute at the run time.
26. Simple program for function
overloading
• // Program to compute absolute value
• // Works both for integer and float
• #include <iostream>
• using namespace std;
• int absolute(int);
• float absolute(float);
• int main() {
• int a = -5;
• float b = 5.5;
•
• cout << "Absolute value of " << a << " = " << absolute(a) << endl;
• cout << "Absolute value of " << b << " = " << absolute(b);
• return 0;
• }
• int absolute(int var) {
• if (var < 0)
• var = -var;
• return var;
• }
• float absolute(float var){
• if (var < 0.0)
• var = -var;
• return var;
• }