DEV Community: S Sarumathi

Python Program

S Sarumathi — Tue, 21 Apr 2026 17:23:06 +0000

1. Remove Extra Space:

name="practice makes    perfect"
i=0
result=""
while i<len(name):
  if name[i]!=" ":
    result=result+name[i]
  else:
    if i>0 and name[i-1]!=" ":
      result=result+name[i]
  i+=1
print(result)

Output:

2. Remove Front Space:

name = "     practice makes perfect"
i = 0
result = ""

while i < len(name):
    if name[i] != " ":
        break   
    i += 1

while i < len(name):
    result += name[i]
    i += 1

print(result)

Output:

3.Remove Back Space:

name = "Kill them with your success        "
result = ""

i = len(name)-1

while i >= 0:

    if name[i] == " ":
        i -= 1
        continue

    else:
        j = 0

        while j <= i:
            result += name[j]
            j += 1

        break

print(result)

Output:

4.Reverse The Word:

name = "PULIKESI"
result = ""

i = len(name)-1

while i >= 0:
    result = result + name[i]
    i -= 1

print(result)

Output:

String Program

S Sarumathi — Tue, 21 Apr 2026 08:30:42 +0000

1.Full String Uppercase:

text=input("Enter some words :")
i=0
upper=""
while i<len(text):
    ch=text[i]
    if ch>="a" and ch<="z":
        upper=upper+chr(ord(ch) - 32)
    else:
        upper=upper+ch
    i+=1
print(upper)

Output:

2.Firts Letter Uppercase:

text=input("Enter some words :")
i=0
upper=""
while i<len(text):
    ch=text[i]
    if (ch>="a" and ch<="z") and (text[i-1]==" " or i==0):
        upper=upper+chr(ord(ch) - 32)
    else:
        upper=upper+ch
    i+=1
print(upper)

Output:

3.Letters Count:

text=input("Enter some words :")
i=0
count=0
while i<len(text):
    ch=text[i]
    if (ch>="a" and ch<="z") or (ch>="A" and ch<="Z"):
        count+=1
    i+=1
print(count)

Output:

4.Word Count:

text=input("Enter some words :")
i=0
count=1
while i<len(text):
    if text[i]!=" " and text[i-1]==" ":
        count+=1
    i+=1
print(count)

Output:

5.Password Verify:

text=input("Create your password :")
i=0
upper=False
lower=False
number=False
special=False
others=True
while i<len(text):
    ch=text[i]
    if ch>="A" and ch<="Z":
        upper=True
    elif ch>="a" and ch<="z":
        lower=True
    elif ch>="0" and ch<="9":
        number=True
    elif ch=="!" or ch=="@" or ch=="#" or ch=="$" or ch=="&":
        special=True
    else:
        others=False
    i+=1
if upper and lower and number and special and others:
    print("password succesfully create")
else:
    print("invalied try another")

Output:

5.Password Generator:

import random

upper="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
lower="abcdefghijklmnopqrstuvwxyz"
numbers="0123456789"
special="!@#$&"

all_chars=upper+lower+numbers+special

password=""

password=password+random.choice(upper)
password=password+random.choice(lower)
password=password+random.choice(numbers)
password=password+random.choice(special)

i=4

while i<8:
    password=password+random.choice(all_chars)
    i+=1

print("Generated Password :",password)

Output:

Pincode Finder

S Sarumathi — Mon, 20 Apr 2026 09:01:05 +0000

regions = {
    1: "Delhi",
    2: "Uttar Pradesh & Uttarakhand",
    3: "Rajasthan & Gujarat",
    4: "Maharashtra",
    5: "Andhra Pradesh & Telangana",
    6: "Tamil Nadu & Kerala",
    7: "West Bengal & North East",
    8: "Bihar & Jharkhand",
    9: "Army Postal Service"
}

sub_regions = {
    11: "Delhi Region",
    40: "Mumbai Region",
    60: "Chennai Region",
    70: "Kolkata Region"
}

districts = {
    110: "Delhi",       111: "Delhi (North)",      112: "Delhi (South)",
    400: "Mumbai",      401: "Mumbai (Suburban)",   402: "Mumbai (West)",
    600: "Chennai",     601: "Tiruvallur",          602: "Kanchipuram",
    700: "Kolkata",     701: "Kolkata (North)",     702: "Kolkata (South)"
}

def get_pincode_details(pincode):
    if not pincode.isdigit() or len(pincode) != 6:
        print("Invalid pincode. Enter exactly 6 digits.")
        return

    num         = int(pincode)
    first_digit = num // 100000
    first_two   = num // 10000
    first_three = num // 1000

    print("Region:     ", regions.get(first_digit,   "Unknown"))
    print("Sub-region: ", sub_regions.get(first_two, "Unknown"))
    print("District:   ", districts.get(first_three, "Unknown"))

# ✅ User input
pincode = input("Enter Pincode: ").strip()
get_pincode_details(pincode)

Output:

Constructor Program In Java

S Sarumathi — Sun, 19 Apr 2026 16:24:33 +0000

public class Shopp {
    String Name;
    int price;
    boolean discountavail;
    int discountper;

    public Shopp(String Name, int price, boolean discountavail, int discountper) {
        this.Name = Name;
        this.price = price;
        this.discountavail = discountavail;
        this.discountper = discountper;
    }

    public static void main(String[] args) {
        Shopp P1 = new Shop("Chocolate", 150, false, 0);
        Shopp P2 = new Shop("Rice", 150, true, 20);
        Shopp P3 = new Shop("Oil", 150, true, 15);
        Shopp P4 = new Shop("Ghee", 150, false, 0);

        P1.buy();
        P2.buy();
        P3.buy();
        P4.buy();
    }

    public boolean discount() {
        return discountavail;
    }

    public int finalPrice() {
        if (discount()) {
            return price - (price * discountper / 100);
        } else {
            return price;
        }
    }

    public void buy() {
        System.out.println("Name: " + Name);
        System.out.println("Price: " + price);
        System.out.println("Discount Available: " + discountavail);
        System.out.println("Discount Percentage: " + discountper);

        if (discount()) {
            System.out.println("Discount Applied: " + discountper + "%");
        }

        System.out.println("Final Price: " + finalPrice());

    }
}

Output:

Pincode, Gmail, Mobile Number Validation Program

S Sarumathi — Fri, 17 Apr 2026 17:18:34 +0000

Pincode Validation:

pincode = int(input("Enter a pincode: "))

count = 0
temp = pincode

while temp > 0:
    temp = temp // 10
    count += 1

if count == 6 and pincode >= 100000 and pincode <= 999999:
    print("YES")
else:
    print("NO")

Output:

Gmail Validation:

def verify_Gmail(Gmail):
    i=0
    while i<len(Gmail):
        current=Gmail[i]
        i+=1
        if current>="a" and current<="z":
            continue;
        elif current>="A" and current<="Z":
            continue;
        elif current>="0" and current<="9":
            continue;
        elif current=="@" or current=="." or current=="_":
            continue;
        else:
            return False
    if Gmail[-10:]=="@gmail.com":
        return True
    else:
        return False
if verify_Gmail(input("Enter Your Gmail :")):
    print("valid")
else:
    print("invalid")

Output:

Mobile Number Validation:

def mobile(n):
    i=0
    while i<len(n):
        if(n[i]>="0" and n[i]<="9") or (n[i]=="+") or (n[i]==" "):
            i+=1
        else:
            return "characters and special charactors not allowed"

    if len(n)==10:
        if n[0]>="6" and n[0]<="9":
            return "valid";
        else:
            return "First number should not be less then 6 "
    if len(n)==13:
        if n[0:3]=="+91":
            if n[3]>="6" and n[3]<="9":
                return "valid"
            else:
                return "Fourth number should not be less then 6"
        else:
            return "First three number should like +91"
    if len(n)==14:
        if n[0:4]=="+91 ":
            if n[4]>="6" and n[4]<="9":
                return "valid"
            else:
                return "fifth number should not be less then 6"
        return "First four number should like +91 "
    return "Please Enter Your valid Mobile Number"      
print(mobile(input("Enter Your Mobile  Number : ")));

Output:

To Be Discussed....

Constructor In Java

S Sarumathi — Fri, 17 Apr 2026 17:12:09 +0000

Constructor:
A constructor in Java is a special member that is called when an object is created. It initializes the new object’s state. It is used to set default or user-defined values for the object's attributes

A constructor has the same name as the class.
It does not have a return type, not even void.
It can accept parameters to initialize object properties

Types Of Constructor:

1. Parameterized Constructor:
A parameterized constructor takes values(parameters) to initialize the object

class Student {
    String name;
    int age;

    Student(String str,int i) {
      name = str;
      age = i;
    }

    public static void main(String[] args) {
        Student s1 = new Student("Ganga",21);
        s1.display();
    }
       void display() {
        System.out.println("Name: " + name);
         System.out.println("age: " + age);
    }
}

Output:

2.Default Constructor:

A default constructor is a constructor with no parameters

class Student

public class Student{
   String name;
    int age;

    Student() {
        System.out.println("Default constructor");
    }

    public static void main(String[] args) {
        Student s1 = new Student();
        s1.name="Ganga";
        s1.age=21;
        s1.display();
    }

    void display() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
    }
}

Output:

3.Constructor Overloading:

Constructor overloading means having multiple constructors in the same class with different parameters lists

public class Student{
   String name;
    int age;


 public  Student(String Name,int i) {
       name=Name;
       age=i;
    }
public Student(){
       System.out.println("Constructor");
}
    public static void main(String[] args) {
        Student s1 = new Student("Ganga",21);

        System.out.println(s1.name);
        System.out.println(s1.age);
        Student s2=new Student();
    }        

}

Output:

Test Case

S Sarumathi — Wed, 15 Apr 2026 17:24:13 +0000

1. What is a Test Case?
A Test Case is a set of conditions or steps used to check whether a software application is working correctly or not. It helps testers verify that the system meets the expected requirements.

2. Why Test Cases are Important?

Ensures software quality
Helps find bugs early
Improves reliability
Makes testing structured and easy

3. Types of Test Cases

Types of Software Testing

** - Functional Testing**
Checks whether the application functions correctly based on requirements.
** Example:** Login, Registration

- Non-Functional Testing
Checks performance, usability, and security.
Example: Load testing, speed testing

- Manual Testing
Test cases are executed manually without automation tools.

- Automation Testing
Uses tools/scripts to execute test cases automatically.

Example: Signup Page

Test Case Table:

SDLC

S Sarumathi — Mon, 13 Apr 2026 04:45:41 +0000

What is SDLC?
The Software Development Life Cycle (SDLC) is a process used by software engineers to plan, build, test, and maintain software applications. It ensures that the final product meets customer requirements and is delivered on time with good quality.

Advantages of SDLC:

Better planning and control
High-quality output
Reduced risks
Clear documentation

Phases of SDLC:

1. Planning – Define project goals, time, and budget.

2. Requirement Analysis – Collect and understand user needs.

3. Design – Create system architecture and UI design.

4. Development – Write and build the code.

5. Testing – Find and fix errors (bugs).

6. Deployment – Release the software to users.

7. Maintenance – Update and fix issues after release.

Popular SDLC Models:

1.Waterfall Model– A linear and simple approach

2.Agile Model – Flexible and iterative development

3.Spiral Model – Focuses on risk analysis

4.V-Model – Testing is done parallel with development

J Meter

S Sarumathi — Sat, 11 Apr 2026 16:57:27 +0000

1. What is Apache JMeter?
Apache JMeter is an open-source performance testing tool used to check how well a website or application performs under heavy load.

Example:

1 user opens website → Works fine
1,000 users open website → Slow? Crash?

JMeter helps you find this before real users face it.

Real-Time Example — Apache JMeter
Example: Flipkart Big Billion Days Sale

During Big Billion Days:

Lakhs of users open Flipkart at the same time
Users try to login
Add products to cart
Make payment

What can happen without testing:

Website becomes slow
Login fails
Payment fails
Website crashes

This leads to:

Customer frustration
Company loss
Bad user experience

How JMeter is Used:

Before the sale, developers use JMeter to simulate:

1,000 users
5,000 users
10,000 users

Then they check:

Website speed
Server performance
Response time
Errors

If website crashes at 8,000 users
Breaking point = 8,000 users

Then developers:

Increase server capacity
Optimize code
Improve performance

3. Why Companies Use JMeter:

Free (Open source)
Easy to use
Supports API testing
Supports web testing
Supports performance testing

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