Forem: S Sarumathi

Self-Introduction

S Sarumathi — Thu, 09 Apr 2026 18:26:07 +0000

My name is S. Sarumathi, and I’m from Chennai.

I have completed my Bachelor of Computer Applications (BCA) from SASTRA Deemed to be University, Kumbakonam.

For my final year project, I worked on “Enhancing Spaces with Creative Interior Design Solutions”, where I developed a web-based platform that simplifies interior design using user-uploaded room images. I used HTML, CSS, JavaScript, and PHP for this project.

Currently, I am pursuing a Full Stack Java course at Payilagam, Chennai. I am familiar with HTML, CSS, and JavaScript.

I am passionate about web development and eager to learn new technologies. I am looking for opportunities to improve my skills and gain real-time experience. Currently, I am seeking a role as a Software Developer where I can enhance my skills and grow professionally.

Constructor In Java Script

S Sarumathi — Thu, 09 Apr 2026 07:29:14 +0000

1. Constructor:
In JavaScript, a constructor is a special function used to create and initialize objects.

Instead of creating objects again and again manually, constructors help you create multiple objects with the same structure easily.

2. Why Constructor is Needed:
Imagine you want to create multiple students:

let student1 = {
  name: "Saha",
  age: 21
}

let student2 = {
  name: "Priya",
  age: 22
}

This works… but it's repetitive and messy.

Instead, use a constructor:

function Student(name, age) {
  this.name = name;
  this.age = age;
}

let student1 = new Student("Saha", 21);
let student2 = new Student("Priya", 22);

console.log(student1);
console.log(student2);

Now you can create unlimited objects easily.

3. Important Rules of Constructor:

1. Constructor Name Starts with Capital Letter:

function Student() {}

This is not mandatory, but it's a standard practice.

2. Use this Keyword:

this refers to the current object being created.

function Student(name, age) {
  this.name = name;
  this.age = age;
}

3. Use new Keyword:

Constructor only works when using new

let s1 = new Student("Saha", 21);

Without new, it won't behave like a constructor.

Example:

function Car(brand, price) {
  this.brand = brand;
  this.price = price;
}

let car1 = new Car("BMW", 5000000);
let car2 = new Car("Audi", 6000000);

console.log(car1);
console.log(car2);

Output:

Car { brand: 'BMW', price: 5000000 }
Car { brand: 'Audi', price: 6000000 }

ASCII Value Program

S Sarumathi — Wed, 08 Apr 2026 16:06:06 +0000

1.What Is Ascii?
ASCII stands for American Standard Code for Information Interchange.

In simple words:
ASCII is a system that gives a number to every character.
Because computers don't understand letters, they only understand numbers.

name="silambu9371@gmail.com"
for(i=0;i<name.length;i++)
{
    console.log(name[i]+ " = " + name.charCodeAt(i));
}

Output:

Explanation:

i = 0 → starts from first character

name.length → total number of characters

i++ → moves to next character

Gets character at position i

Example:
name[0] → 's'
name[1] → 'i'
name[2] → 'l'

name.charCodeAt(i)

Converts character → ASCII number

Example:
's' → 115
'i' → 105
'l' → 108
'a' → 97

Prints: character = ASCII value

ASCII

S Sarumathi — Wed, 08 Apr 2026 15:07:38 +0000

ASCII stands for
American Standard Code for Information Interchange

ASCII is a number assigned to every character.

Computers don't understand letters like A, B, a, b.
Computers only understand numbers.

How does ASCII work?
Each character is assigned a unique number.
Some examples:

A → 65
B → 66
a → 97
1 → 49
Space → 32

Example:
The word “HELLO” becomes:
72 69 76 76 79 (ASCII Values)

Why is ASCII used?

1. Computer Communication:
ASCII ensures different computers understand the same data.

2. Data Storage:
When you save text, characters are stored as numbers.

3. Programming:
Languages like Java, Python, C, and JavaScript use ASCII internally.

Types of ASCII:

1. Standard ASCII:
Range: 0 to 127
Includes basic English characters
2. Extended ASCII:
Range: 128 to 255
Includes additional symbols

ASCII vs Unicode:

ASCII is old and supports only 128 characters.
But modern languages need more characters like:
தமிழ்
हिंदी
Chinese
Emojis

So Unicode was introduced.

Still, ASCII is the foundation for understanding character encoding.

String Program

S Sarumathi — Wed, 08 Apr 2026 09:11:39 +0000

1. What is String?

A String is a sequence of characters.

In simple words:
String = collection of letters, numbers, or symbols inside quotes

Examples of String

"Hello"
"Java"
"12345"
"Chennai"
"Hello@123"

All of these are Strings because they are inside double quotes.
Program:

const str="priya"
console.log(str[0]);

Output:

const str="priya"
console.log(str[str.length-1]);

Output:

const str="priya"
console.log(str[Math.floor(str.length/2)]);

Output:

const str="priya"
console.log(str.toUpperCase());

Output:

const str="priya"
console.log(str.toLowerCase());

Output:

let str="priya"
str=str.toUpperCase()
console.log(str.toUpperCase());
console.log(str.toLowerCase());
console.log(str);

Output:

let name = "saha";

let result = name[0].toUpperCase() + 
             name.slice(1, -1) + 
             name[name.length - 1].toUpperCase();

console.log(result);

Output:

let name = "saha";

let mid = Math.floor(name.length / 2);

let result = name.slice(0, mid) + 
             name[mid].toUpperCase() + 
             name.slice(mid + 1);

console.log(result);

Output:

Method Overloading In Java

S Sarumathi — Wed, 08 Apr 2026 08:07:41 +0000

1.Method Overloading:
Method Overloading means using the same method name with different parameters in the same class.

In simple words:

Same Method Name
Different Input
Different Behavior

This is called Method Overloading.

Why Do We Use Method Overloading?

Without method overloading, we would write like this:

addTwoNumbers()
addThreeNumbers()
addFourNumbers()

This makes the code messy and hard to maintain.

Instead, we use:

add()
add()
add()

Same method name — cleaner and easier to understand.

Simple Example:

class Student {

    void add(int a, int b){
        System.out.println(a + b);
    }

    void add(int a, int b, int c){
        System.out.println(a + b + c);
    }

    public static void main(String[] args){
        Student s = new Student();

        s.add(10,20);
        s.add(10,20,30);
    }
}

Output:

30
60

Here:

add(10,20) calls first method
add(10,20,30) calls second method

Same method name, but different parameters.

This is Method Overloading.

Rules for Method Overloading:

Method overloading happens when:

1. Number of Parameters Changes:
- add(int a, int b)

add(int a, int b, int c)

2. Data Type Changes:

add(int a, int b)
add(double a, double b)

3. Order of Parameters Changes:

add(int a, double b)
add(double a, int b)

Advantages of Method Overloading:

Makes code clean
Easy to read
Easy to maintain
Reduces duplicate method names
Improves code flexibility

Methods In Java

S Sarumathi — Wed, 08 Apr 2026 07:51:04 +0000

1. Void method with no return value:

public class Calculator {
    public static void main(String[] args) {
    Calculator casio=new Calculator();
    casio.add();
    }
    public void add(){
        return;
    }
}

Output:

Explanation:

- display() method has void return type

- return; is used just to exit the method

- Since there is no print statement, nothing is displayed.

Output: Nothing is displayed

2. Mark Calculation Program:

public class Student {
    public static void main(String[] args) {
    Student marks=new Student();

    int tot=marks.total(70,90,100,99,98);
    System.out.println(tot);

    int avg=marks.average(tot);
    System.out.println(avg);

      String gra=marks.grade(avg);
    System.out.println(gra);
    }
    public int total(int no1,int no2,int no3,int no4,int no5){
        int result=no1+no2+no3+no4+no5;
        return result;
    }

    public int average(int total){
        int result=total/5;
        return result;
    }
 public String grade(int avg){
        if(avg>=90){
            return "A";
        }
        else if(avg >= 85){
            return "B";
        }
            else if(avg >= 80){
            return "C";
        }
            else if(avg >= 70){
            return "D";
        }
            else if(avg >= 60){
            return "E";
        }
            else{
            return "F";
        }
    }

}

Output:

Return Type In Java

S Sarumathi — Tue, 07 Apr 2026 15:34:10 +0000

1. What is Return Type in Java?

Return type in Java means what value a method gives back after execution.

Syntax:

returnType methodName(){
    // code
    return value;
}

Example:

int add(){
    return 10;
}

Here:

int → return type
add() → method name
return 10 → returning value

So this method returns integer value.

2. Why Return Type is Used

1. To Send Result Back

class Demo {
    static int add(){
        return 5 + 3;
    }

    public static void main(String args[]){
        int result = add();
        System.out.println(result);
    }
}

Output:

Here:

add() returns 8
main method receives it
prints result

Without return → you cannot send value back.

Example Without Return Type:

class Demo {
    static void add(){
        System.out.println(5 + 3);
    }

    public static void main(String args[]){
        add();
    }
}

Output:

Here:

void means no return value
Only prints
Can't store result

You cannot do this:

int result = add();   // ERROR

Because void returns nothing.

Methods In Java

S Sarumathi — Tue, 07 Apr 2026 05:24:19 +0000

What is a Method in Java?

A method in Java is a block of code that performs a specific task. It runs only when it is called (invoked).
- Think of a method like a mini-program inside your program.

Basic Syntax

returnType methodName(parameters) {
    // method body
}

Example:

class Demo {
    void display() {
        System.out.println("Hello World");
    }
}

Types of Methods in Java:

1. Predefined Methods:
These are already available in Java.

Example:

Math.sqrt(25);
System.out.println("Hello");

2. User-defined Methods:
Methods created by the programmer.

Example:

class Demo {
    void greet() {
        System.out.println("Welcome!");
    }
}

Global Vs Local Variable In Java

S Sarumathi — Mon, 06 Apr 2026 15:30:42 +0000

1. Global Variable:
Java technically does not have "global variables" like C or Python.
But in Java, variables declared inside a class but outside methods are treated like global variables.

These are also called:

Instance variables
Class variables (if static)

Example:

class Student {

    int age = 20;   // Global Variable
    void display() {
        System.out.println(age);
    }

    public static void main(String[] args) {
        Student obj = new Student();
        obj.display();
    }
}

Output:

Why This is Global Variable:

Because:

It is declared inside class
Outside method
Can be used in multiple methods

2.Local Variable:
A Local Variable is declared inside a method, constructor, or block.

It can only be used inside that method.

Example:

class Test {

    void display() {
        int num = 10;  // Local Variable
               System.out.println(num);
    }

    public static void main(String args[]) {
        Test obj = new Test();
        obj.display();
    }
}

Output:

Scripting Vs Programming Language

S Sarumathi — Mon, 06 Apr 2026 06:32:24 +0000

1. Scripting Language:
A Scripting Language is used to automate tasks and execute programs directly without compilation. These languages run using an interpreter

Scripting languages are generally:

Easy to learn
Quick to write
Faster to test
Used for automation and small tasks

Examples of Scripting Languages:

Python
JavaScript
PHP
Ruby
Bash

Scripting languages are commonly used for:

Automation
Web development
Data processing
System administration tasks

2. Programming Language:
A Programming Language is used to build complete software applications and systems. These languages usually require compilation before execution.

Programming languages are generally used for:

Building large applications
Developing system software
Creating mobile and desktop applications
Developing enterprise-level software

Examples of Programming Languages:

Java
C
C++
Go
Rust

Programming languages typically provide:

Better performance
More control over system resources
Ability to develop large-scale applications

Because of this, programming languages are commonly used in professional software development.

Perfect Number Program

S Sarumathi — Fri, 03 Apr 2026 17:44:58 +0000

3. Perfect Number Program:
Java Script Program:

function divisor(n) {
    let div = 1;
    let divsum = 0;

    while (div <= n / 2) {
        if (n % div == 0) {
            divsum = divsum + div;
        }
        div++;
    }

    if (n == divsum) {
        console.log(n + " is perfect");
    } else {
        console.log(n + " is not perfect");
    }
}

divisor(6);

Output:

Java Program:

class PerfectNumber {

    static void divisor(int n) {

        int div = 1;
        int divsum = 0;

        while (div <= n / 2) {
            if (n % div == 0) {
                divsum = divsum + div;
            }
            div++;
        }

        if (n == divsum)
            System.out.println(n + " is perfect");
        else
            System.out.println(n + " is not perfect");
    }

    public static void main(String args[]) {
        divisor(6);
    }
}

Python Program:

def divisor(n):
    div=1
    divsum=0
    while div<=n/2:
        if n%div==0:
            divsum=divsum+div
        div+=1
    if n==divsum:
        print(n," is perfect")
    else:
        print(n," is not perfect")
divisor(6)