Module 11
   Sourangshu
  Bhattacharya                    Module 11: Programming in C++
 Objectives &                                         Classes and Objects
 Outline
 Classes
 Objects
 Data Members                                   Sourangshu Bhattacharya
  Complex
  Rectangle
  Stack                                Department of Computer Science and Engineering
 Member                                    Indian Institute of Technology, Kharagpur
 Functions
  Complex                                          sourangshu@cse.iitkgp.ac.in
  Rectangle
  Stack
 this pointer                    Slides taken from NPTEL course on Programming in C++
 State of an                                       by Prof. Partha Pratim Das
 Object
  Complex
  Rectangle
  Stack
                    Software Engineering 2022                       Sourangshu Bhattacharya                       1
 Summary
                  Module Objectives
   Module 11
   Sourangshu             Understand the concept of classes and objects in C++
  Bhattacharya
 Objectives &
 Outline
 Classes
 Objects
 Data Members
  Complex
  Rectangle
  Stack
 Member
 Functions
  Complex
  Rectangle
  Stack
 this pointer
 State of an
 Object
  Complex
  Rectangle
  Stack
                   Software Engineering 2022                      Sourangshu Bhattacharya                      2
 Summary
                  Module Outline
   Module 11
   Sourangshu             Classes
  Bhattacharya            Objects
 Objectives &             Data Members of a class
 Outline
 Classes                  Member functions of a class
 Objects                  this Pointer
 Data Members
  Complex                 State of an Object
  Rectangle
  Stack
 Member
 Functions
  Complex
  Rectangle
  Stack
 this pointer
 State of an
 Object
  Complex
  Rectangle
  Stack
                   Software Engineering 2022                      Sourangshu Bhattacharya                      3
 Summary
                  Classes
   Module 11               Aclass is an implementation of a type. It is the only way to
                           implement User-defined Data Type (UDT)
   Sourangshu
  Bhattacharya             Aclass contains data members / attributes
 Objectives &              Aclass has operations / member functions / methods
 Outline
 Classes                   Aclass defines a namespace
 Objects                   Thus, classes offer data abstraction / encapsulation of
 Data Members              Object Oriented Programming
  Complex
  Rectangle
  Stack                    Classes are similar to structures that aggregate data logically
 Member                    Aclass is defined by class keyword
 Functions
  Complex
  Rectangle                Classes provide access specifiers for members to enforce data
  Stack                    hiding that separates implementation from interface
 this pointer
 State of an                      private — accessible inside the definition of the class
 Object                           public — accessible everywhere
  Complex
  Rectangle                Aclass is a blue print for its instances (objects)
  Stack
                    Software Engineering 2022                       Sourangshu Bhattacharya                       4
 Summary