Object Oriented Programming: Object Oriented Programming Fundamentals

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Properties of Object Oriented Programming Language

The programming model "Object Oriented Programming" is based on the following properties:

Class :The abstract definition of a particular entity type(real life), which include encapsulated definition of variables and associated functions. Example: Chair, Table, Football, Student etc.

Object :An element defined under a Class and exist in the real world and also can be distinguishable from other objects. A student Ram under the class Student will be treated as a student.

Encapsulation :Integration of variables and functions in a single unit.

Data Hiding :Control in terms of accessibility of member variables and functions.

Inheritance :The way of derivation of existing properties from one class into another class

Polymorphism :Multiple view of something or the capacity to perform multiple task by same(named) function.

NOTE:

1. Member Variable: Any Variable under a class.

2. Member Function: Any Function under a class.

Consider the class with following specifications

Name of the class: My_Integer
Member variable: x as an integer
Member functions:

Read_Integer()
Show_Integer()

Java Implementation of class My_Integer.

Implementation 01

Program Reference: Java_Programs/ Day_02/ Prog_01.java
import java.util.Scanner;
import static java.lang.System.out;

class My_Integer
{
public int x;
};

class Integer_Addition
{
public static void main(String args[])
{
    My_Integer a, b;
    a = new My_Integer();
    b = new My_Integer();

    Scanner S = new Scanner(System.in);

    out.print("\nPlease Enter an Integer: ");
    a.x = S.nextInt();

    out.print("\nPlease Enter another Integer: ");
    b.x = S.nextInt();

    S.close();

    out.print("\nResult of Addition is: ");
    out.println(a.x+b.x);
    out.print("\n\n");

    return;
}
};

Output:
$ javac Prog_01.java
$ java Integer_Addition

Please Enter an Integer: 12

Please Enter another Integer: 10

Result of Addition is: 22

$

Implementation 02

Program Reference: Java_Programs/ Day_02/ Prog_02.java
import java.util.Scanner;
import static java.lang.System.out;

class My_Integer
{
public int x;
public void Show_Integer()
{ out.print("\nThe Value is: "+x); }
};

class Integer_Addition
{
public static void main(String args[])
{
    My_Integer a, b, c;
    a = new My_Integer();
    b = new My_Integer();
    c = new My_Integer();

    Scanner S = new Scanner(System.in);

    out.print("\nPlease Enter an Integer: ");
    a.x = S.nextInt();

    out.print("\nPlease Enter another Integer: ");
    b.x = S.nextInt();

    S.close();

    c.x= a.x+b.x;
    c.Show_Integer();
    out.print("\n\n");

    return;
}
};

Output:
$ javac Prog_02.java
$ java Integer_Addition

Please Enter an Integer: 12

Please Enter another Integer: 10

The Value is: 22

$

Implementation 03

Program Reference: Java_Programs/ Day_02/ Prog_03.java
import java.util.Scanner;
import static java.lang.System.out;

class My_Integer
{
public int x;

public void Read_Integer()
{
    Scanner S = new Scanner(System.in);

    out.print("\nPlease Enter an Integer: ");
    x = S.nextInt();
}

public void Show_Integer()
{ out.print("\nThe Value is: "+x); }
};

class Integer_Addition
{
public static void main(String args[])
{
    My_Integer a, b, c;
    a = new My_Integer();
    b = new My_Integer();
    c = new My_Integer();

    a.Read_Integer();
    b.Read_Integer();
    c.x= a.x+b.x;

    c.Show_Integer();
    out.print("\n\n");

    return;
}
};

Output:
$ javac Prog_03.java
$ java Integer_Addition

Please Enter an Integer: 12

Please Enter an Integer: 10

The Value is: 22

$

C++ Implementation of class My_Integer.

Implementation 01

Program Reference: Cpp_Programs/ Day_02/ Prog_01.cpp
using namespace std;

#include<stdlib.h>
#include <iostream>
class My_Integer
{
public: int x;
};

int main(void)
{
My_Integer a, b;

system("clear");

cout<<"\nEnter an Integer: ";
cin>>a.x;

cout<<"\nEnter another Integer: ";
cin>>b.x;

cout<<"\n\nResult of Addition is: ";
cout<<a.x+b.x;
cout<<"\n\n";
}

Output:
$ g++ Prog_01.cpp
$ ./a.out
Enter an Integer: 12

Enter another Integer: 10

Result of Addition is: 22

$

Implementation 02

Program Reference: Cpp_Programs/ Day_02/ Prog_02.cpp
using namespace std;

#include<stdlib.h>
#include <iostream>
class My_Integer
{
public: int x;
void Show_Integer()
{ cout<<"\nThe Value is: "<<x; }
};

int main(void)
{
My_Integer a, b, c;

// system("clear");

cout<<"\nEnter an Integer: ";
cin>>a.x;

cout<<"\nEnter another Integer: ";
cin>>b.x;

c.x= a.x+b.x;
c.Show_Integer();
cout<<"\n\n";
}

Output:
$ g++ Prog_02.cpp
$ ./a.out

Enter an Integer: 12

Enter another Integer: 10

The Value is: 22

$

Implementation 03

Program Reference: Cpp_Programs/ Day_02/ Prog_03.cpp
using namespace std;

#include<stdlib.h>
#include <iostream>
class My_Integer
{
public: int x;

void Show_Integer()
{ cout<<"\nThe Value is: "<<x; }

void Read_Integer()
{
cout<<"\nEnter an Integer: ";
cin>>x;
}

};

int main(void)
{
My_Integer a, b, c;

a.Read_Integer();
b.Read_Integer();

c.x= a.x+b.x;
c.Show_Integer();
cout<<"\n\n";
}

Output:
$ g++ Prog_03.cpp
$ ./a.out

Enter an Integer: 12

Enter an Integer: 10

The Value is: 22

$

Thursday, July 23, 2020

Object Oriented Programming Fundamentals

Properties of Object Oriented Programming Language