The document provides a history of object-oriented programming languages and their features. It traces the evolution of object-oriented languages from Simula in 1960 to Java in 1995. It describes the key aspects of object-oriented programming including its bottom-up design approach organized around objects and classes, with a focus on data and methods that operate on object data and allow interaction between objects. Features like inheritance and polymorphism provide reusability. The document also compares procedural programming in C to object-oriented programming in C++, highlighting how C++ supports encapsulation of data and functions into objects with access specifiers and other OOP features like overloading.

1. History of Object Oriented Language
Year Language
1960 Simula (Simulation of real
systems)
1970 Smalltalk
1979 C++
1995 Java
Prof Bhushan L Rathi

2. Object Oriented Paradigm
1) Based upon objects (having both data and methods)
2) Objects, which are usually instances of classes
class name_of_type
{
public:
// function prototypes here
private:
// member data here
};
Prof Bhushan L Rathi

3. Features of object–oriented programming are −
 Bottom–up approach in program design
 Programs organized around objects, grouped in classes
 Focus on data with methods to operate upon object’s
data
 Interaction between objects through functions
 Reusability of design through creation of new classes
by adding features to existing classes
Prof Bhushan L Rathi

4. Prof Bhushan L Rathi

5. C C++
C supports procedural programming
paradigm for code development.
C++ supports both procedural and
object oriented programming
paradigms
In C data and functions are separate
and free entities.
In C++ data and functions are
encapsulated together in form of an
object.
C does not allow functions to be
defined inside structures.
In C++, functions can be used inside a
structure.
C uses functions for input/output. For
example scanf and printf.
C++ uses objects for input output. For
example cin and cout.
C has no support for virtual and friend
functions.
C++ supports virtual and friend
functions.
Provides malloc() and calloc()functions
for dynamic memory allocation,
and free() for memory de-allocation.
C++ provides new operator for memory
allocation and delete operator for
memory de-allocation.
Prof Bhushan L Rathi

6. POP Vs OOP
POP OOP
In POP program divided into small
part called function
In OOP program divided into small
part called object
POP dose not have any access
specifier
OOP has access specifier as :
public, private, protected
POP dose not have any proper way
of hiding data so less secure
OOP data hiding so more secure
In POP overloading is not possible In OOP overloading is possible in
the form of function & operator
overloading
In POP most function uses global
data for sharing that can be access
freely from function to function
In OOP data cant move easily from
function to function
E.g : C, VB, Pascal E.g: C++, Java,VB.Net
Prof Bhushan L Rathi