This document provides an overview of object-oriented programming concepts like classes, structures, and the program execution process in C++, Java, and other languages. It begins with definitions of basic terms like data and information. It then covers key OOP concepts like classes and structures in C++, highlighting how classes are more complex and can be inherited while structures are simpler groups of variables. The document also outlines the typical execution flow for C/C++ and Java programs, including details on compilers, linkers, loaders, and JVMs. Sample code examples are provided to illustrate classes and structures.

1. Object Oriented Programming
Roadmap to Introduction to Object Oriented
Programming
Prepared by,
Mr.S. Ezra Vethamani
Assistant Professor/CSE
SRM Institute of Science and Technology
Ramapuram Campus
Chennai- 600 089

2. BASICS – BEFORE GET INTO OOP.
 What is DATA?
 Data is any collection of numbers, characters
orother symbols.
 Data on its own has no meaning.
 Examples: City, Time , Temperature

3. WHAT IS DATA? CONT…

4. BASICS – BEFORE GET INTO OOP CONT.
 What is INFORMATION?
 It is only data after processing by a computer and
becomes information.
 Example: The morning temperature of the city
Chicago is 62.
 What is Program?
 Program is a collection of instructions that can be
executed by a computer to perform a specific task.

5. BASICS – BEFORE GET INTO OOP CONT.

6. BASICS – BEFORE GET INTO OOP.
 #include<stdio.h>
 //function to find largest among three number
 float large(float a, float b, float c) //
 {
 if(a>=b && a>=c)
 return a;
 else if(b>=a && b>=c)
 return b;
 else
 return c;
 }
 int main()
 {
 float num1, num2, num3, largest;
 printf("Enter three numbers: ");
 scanf("%f %f %f", &num1, &num2, &num3);
 largest = large(num1, num2, num3);
 printf("Largest number = %.2f",largest);
 return 0;
 }
Output:-
Enter three numbers: 12.5 8 6.9
Largest number = 12.50
Enter three numbers: 3 5.9 6.0
Largest number = 6.00

7. BASICS – BEFORE GET INTO OOP.
 What is STRUCTURE?
 Structure is a group of variables of different data types
represented by a single name.
 Store the data of students like student name, age, address,
id etc. of different types. ( Array not possible)
 Example
 /* Created a structure here. The name of the structure is *
StudentData. */
 struct StudentData
 {
 char *name;
 int id;
 int age;
 float height;
 };
/* student is the variable of
structure StudentData*/
struct StudentData student;

8. BASIC STRUCTURE OF C PROGRAM

9. BASIC STRUCTURE OF C++ PROGRAM

10. BASIC EXAMPLE OF C++ PROGRAM
 #include<iostream.h> // header files
 class MyClass { // The class
public: // Access specifier
int myNum; // Attribute (int variable)
string myString; // Attribute (string variable)
};
int main() {
MyClass myObj; // Create an object of MyClass
// Access attributes and set values
myObj.myNum = 15;
myObj.myString = “OOPs";
// Print attribute values
cout << myObj.myNum << "n";
cout << myObj.myString;
return 0;
}
OUTPUT :
15
OOPs

11. CLASS VS. STRUCTURE IN C++ PROGRAM

12. C++ CLASS C++ STRUCTURE
CLASS VS. STRUCTURE IN C++ PROGRAM
 Extension of Structure
 Collections of
variables/data
 Members are private
/public/protected
 Members are by
default private.
 Classes are inherited
 Complex programs
 Structure is a collection
of variables of different
data types under a single
name.
 Collections of
variables/data
 Members are private
/public/protected
 Members are by default
public.
 Not inherited
 Simple programs

13. CLASS VS STRUCTURE IN C++ PROGRAM

14. Linker is a system
program that takes one
or more object files and
combines them into a
single executable file,
library file, or another
'object' file.
Loader is the part of an
operating system that
is responsible for
loading programs and
libraries.
C & C++ PROGRAM EXECUTION FLOW

15. BASIC STRUCTURE OF JAVA PROGRAM

16. JAVA PROGRAM EXECUTION FLOW

17. JAVA PROGRAM EXECUTION FLOW

18. SIMPLE EXAMPLE PROGRAMS