WindowsJava

app-conponent.html

<!-- app.component2.html -->
<table style="width: 100%;">
  <tr>
    <!-- Left side (Login Component) -->
    <td style="width: 30%;">
      <app-login></app-login>
    </td>

    <!-- Right side (Instructions and Advertisement stacked) -->
    <td style="vertical-align: top;">
      <!-- Instructions Component -->
      <app-instructions></app-instructions>

      <!-- Advertisement Component -->
      <app-advertisement></app-advertisement>
    </td>
  </tr>
</table>










// Implementation of the overloaded function
function sum(x: number | string, y: number | string, z?: number, p?: number): number | string {
  if (typeof x === 'number' && typeof y === 'number') {
    if (z !== undefined && p !== undefined) {
      // Implementation for overloaded function: int sum(int x, int y, int z, int p)
      return x + y + z + p;
    } else {
      // Implementation for overloaded function: int sum(int x, int y)
      return x + y;
    }
  } else if (typeof x === 'string' && typeof y === 'string') {
    // Implementation for overloaded function: string sum(string x, string y)
    return x + y;
  }
  // Return a default value or handle the case as needed
  return 0; // For example, you can return 0 for invalid cases
}

// Examples
console.log(sum(1, 2));         // Output: 3
console.log(sum('Hello', ' World'));  // Output: Hello World
console.log(sum(1, 2, 3, 4));    // Output: 10







// Employees.cs
using System.Collections.Generic;

public class Employees
{
    private List<Employee> empList;

    public Employees()
    {
        empList = new List<Employee>();
        // Add 3 employees to empList (as per your requirement)
        empList.Add(new Employee(1, "John Doe"));
        empList.Add(new Employee(2, "Jane Smith"));
        empList.Add(new Employee(3, "Bob Johnson"));
    }

    public List<Employee> ReturnList()
    {
        return empList;
    }

    public void AddEmp(int id, string name)
    {
        empList.Add(new Employee(id, name));
    }
}






Controller:
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

public class MCQController : Controller
{
    // Action for the first question
    public IActionResult Question1()
    {
        return View();
    }

    // Action for processing the answer to the first question
    [HttpPost]
    public IActionResult Question1(string answer)
    {
        // Set or update the cookie for Question 1
        Response.Cookies.Append("Q1", answer);

        // Redirect to the second question
        return RedirectToAction("Question2");
    }

    // Action for the second question
    public IActionResult Question2()
    {
        return View();
    }

    // Action for processing the answer to the second question
    [HttpPost]
    public IActionResult Question2(string answer)
    {
        // Set or update the cookie for Question 2
        Response.Cookies.Append("Q2", answer);

        // Redirect to the third question
        return RedirectToAction("Question3");
    }

    // Action for the third question
    public IActionResult Question3()
    {
        return View();
    }

    // Action for processing the answer to the third question
    [HttpPost]
    public IActionResult Question3(string answer)
    {
        // Set or update the cookie for Question 3
        Response.Cookies.Append("Q3", answer);

        // Redirect to the "See Results" page
        return RedirectToAction("SeeResults");
    }

    // Action to see the results
    public IActionResult SeeResults()
    {
        // Calculate total marks based on correct answers
        int totalMarks = CalculateTotalMarks();

        // Pass the total marks to the view
        ViewBag.TotalMarks = totalMarks;

        // Display the results
        return View();
    }

    // Helper method to calculate total marks
    private int CalculateTotalMarks()
    {
        int totalMarks = 0;

        // Compare user answers with correct answers
        if (HttpContext.Request.Cookies["Q1"] == "CorrectAnswerForQ1")
        {
            totalMarks++;
        }

        if (HttpContext.Request.Cookies["Q2"] == "CorrectAnswerForQ2")
        {
            totalMarks++;
        }

        if (HttpContext.Request.Cookies["Q3"] == "CorrectAnswerForQ3")
        {
            totalMarks++;
        }

        return totalMarks;
    }
}
Question1.cshtml
<!DOCTYPE html>
<html>
<head>
    <title>Question 1</title>
</head>
<body>
    <h2>Question 1</h2>
    <p>Select the correct answer:</p>

    <form method="post" action="/MCQ/Question1">
        <select name="answer">
            <option value="Option1">Option 1</option>
            <option value="Option2">Option 2</option>
            <option value="Option3">Option 3</option>
            <option value="Option4">Option 4</option>
        </select>

        <button type="submit">Next</button>
    </form>
</body>
</html>
Question2.cshtml
<!DOCTYPE html>
<html>
<head>
    <title>Question 2</title>
</head>
<body>
    <h2>Question 2</h2>
    <p>Select the correct answer:</p>

    <form method="post" action="/MCQ/Question2">
        <select name="answer">
            <option value="Option1">Option 1</option>
            <option value="Option2">Option 2</option>
            <option value="Option3">Option 3</option>
            <option value="Option4">Option 4</option>
        </select>

        <button type="submit">Next</button>
    </form>

    <form method="post" action="/MCQ/Question1">
        <button type="submit">Previous</button>
    </form>
</body>
</html>
Question3.cshtml
<!DOCTYPE html>
<html>
<head>
    <title>Question 3</title>
</head>
<body>
    <h2>Question 3</h2>
    <p>Select the correct answer:</p>

    <form method="post" action="/MCQ/Question3">
        <select name="answer">
            <option value="Option1">Option 1</option>
            <option value="Option2">Option 2</option>
            <option value="Option3">Option 3</option>
            <option value="Option4">Option 4</option>
        </select>

        <button type="submit">Submit</button>
    </form>

    <form method="post" action="/MCQ/Question2">
        <button type="submit">Previous</button>
    </form>
</body>
</html>
Last:
<!DOCTYPE html>
<html>
<head>
    <title>See Results</title>
</head>
<body>
    <h2>Results</h2>
    <p>Your total marks: @ViewBag.TotalMarks</p>
</body>
</html>







public class AccountController : Controller
{
    // Implement login actions here
    public ActionResult Login()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Login(string username, string password)
    {
        // Check if the input is valid (you can implement validation logic here)
        if (!string.IsNullOrEmpty(username) && !string.IsNullOrEmpty(password))
        {
            // Save user input in cookies
            SetLoginCookies(username, password);
            return RedirectToAction("Inbox");
        }
        else
        {
            ViewBag.ErrorMessage = "Invalid input. Please try again.";
            return View();
        }
    }

    private void SetLoginCookies(string username, string password)
    {
        // Set cookies for username and password (you can also encrypt the password)
        Response.Cookies["Username"].Value = username;
        Response.Cookies["Password"].Value = password;
    }
}

public class InboxController : Controller
{
    // Implement inbox actions here
    public ActionResult Inbox()
    {
        // Check if the user input (cookies) is present
        if (Request.Cookies["Username"] != null && Request.Cookies["Password"] != null)
        {
            // Retrieve scratch messages and display them
            List<ScratchMessage> messages = GetScratchMessages();
            return View(messages);
        }
        else
        {
            // Redirect to the login page if input is not provided
            return RedirectToAction("Login", "Account");
        }
    }

    private List<ScratchMessage> GetScratchMessages()
    {
        // Implement code to retrieve scratch messages (e.g., from a database)
        // For demo purposes, return some dummy data
        return new List<ScratchMessage>
        {
            new ScratchMessage { Subject = "Message 1", Content = "Hello, World!" },
            new ScratchMessage { Subject = "Message 2", Content = "This is a test message." }
        };
    }
}







cmd.Parameters.AddWithValue("@Name", name);
                    cmd.Parameters.AddWithValue("@UserName", userName);
                    cmd.Parameters.AddWithValue("@Password", password);




Database:-
using System;
using System.Data.SqlClient;

class Program
{
    static void Main(string[] args)
    {
        Console.Write("Enter username: ");
        string username = Console.ReadLine();

        Console.Write("Enter password: ");
        string password = Console.ReadLine();

        string connectionString = "Data Source=yourServerName;Initial Catalog=yourDatabaseName;Integrated Security=True";

        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();

            string query = "SELECT COUNT(*) FROM Login WHERE uname = @username AND passwd = @password";
            
            using (SqlCommand command = new SqlCommand(query, connection))
            {
                command.Parameters.AddWithValue("@username", username);
                command.Parameters.AddWithValue("@password", password);

                int count = (int)command.ExecuteScalar();

                if (count > 0)
                {
                    Console.WriteLine("Login successful");
                }
                else
                {
                    Console.WriteLine("Login NOT successful");
                }
            }
        }
    }
}





Form.cshtml
@model ExerciseMVC.Models.Student

<h2>Student Form</h2>
<form asp-controller="Student" asp-action="Welcome" method="post">
    <div class="form-group">
        <label for="firstName">First Name:</label>
        <input type="text" class="form-control" id="firstName" name="firstName">
    </div>
    <div class="form-group">
        <label for="lastName">Last Name:</label>
        <input type="text" class="form-control" id="lastName" name="lastName">
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>






Contact:-----
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Contact Us - ABC IT Solutions</title>
</head>
<body>
    <header>
        <h1>Contact Us</h1>
    </header>
    <nav>
        <ul>
            <li><a href="index.html">Home</a></li>
            <li><a href="about.html">About Us</a></li>
            <li><a href="contact.html">Contact Us</a></li>
        </ul>
    </nav>
    <section>
        <h2>Contact Information</h2>
        <p>If you have any questions or inquiries, please contact us using the form below:</p>
        <form action="index.html" method="post">
            <label for="name">Name:</label>
            <input type="text" id="name" name="name" required>
            <br>
            <label for="email">Email:</label>
            <input type="email" id="email" name="email" required>
            <br>
            <!-- Add other form fields as needed -->
            <input type="submit" value="Submit">
        </form>
    </section>
</body>
</html>





About:----
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>About Us - ABC IT Solutions</title>
</head>
<body>
    <header>
        <h1>About Us</h1>
    </header>
    <nav>
        <ul>
            <li><a href="index.html">Home</a></li>
            <li><a href="about.html">About Us</a></li>
            <li><a href="contact.html">Contact Us</a></li>
        </ul>
    </nav>
    <section>
        <h2>About Our Directors</h2>
        <p>Our directors are dedicated professionals with years of experience in the IT industry.</p>
    </section>
</body>
</html>




Main:-------
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ABC IT Solutions</title>
</head>
<body>
    <header>
        <h1>Welcome to ABC IT Solutions</h1>
    </header>
    <nav>
        <ul>
            <li><a href="index.html">Home</a></li>
            <li><a href="about.html">About Us</a></li>
            <li><a href="contact.html">Contact Us</a></li>
        </ul>
    </nav>
    <section>
        <h2>Our Directors</h2>
        <ul>
            <li>Director 1</li>
            <li>Director 2</li>
            <li>Director 3</li>
            <li>Director 4</li>
            <li>Director 5</li>
        </ul>
        <h2>About Our Services</h2>
        <p>We provide a wide range of IT solutions to meet your business needs.</p>
    </section>
</body>
</html>






CREATE FUNCTION GetEligibleGifts()
RETURNS TABLE
AS
RETURN (
    SELECT
        c.Customer_id,
        c.ZipCode,
        CASE WHEN dbo.chkPrime(c.ZipCode) = 'yes' THEN 'yes' ELSE 'no' END AS EligibleGift
    FROM
        customers c
);









CREATE FUNCTION chkPrime(@n INT)
RETURNS NVARCHAR(50)
AS
BEGIN
    DECLARE @i INT;
    DECLARE @isPrime BIT = 1;

    -- Check if the number is even
    IF @n % 2 = 0
    BEGIN
        RETURN 'even';
    END

    -- Check if the number is 1
    IF @n = 1
    BEGIN
        RETURN 'odd';
    END

    -- Check for odd prime numbers
    SET @i = 3;
    WHILE @i <= SQRT(@n)
    BEGIN
        IF @n % @i = 0
        BEGIN
            SET @isPrime = 0;
            BREAK;
        END
        SET @i = @i + 2;
    END

    IF @isPrime = 1
    BEGIN
        RETURN 'oddprime';
    END
    ELSE
    BEGIN
        RETURN 'odd';
    END
END;









using System;
using System.Collections.Generic;

class Employee
{
    public string Name { get; set; }
    public string Designation { get; set; }
}

class Program
{
    static void Main()
    {
        DesignationLists d = new DesignationLists();
        int choice;
        do
        {
            Console.WriteLine("Menu:");
            Console.WriteLine("1. Add Employee");
            Console.WriteLine("2. Display Employees");
            Console.WriteLine("3. Exit");
            Console.Write("Enter your choice: ");
            if (int.TryParse(Console.ReadLine(), out choice))
            {
                switch (choice)
                {
                    case 1:
                        Employee e = new Employee();
                        Console.Write("Enter employee name: ");
                        e.Name = Console.ReadLine();
                        Console.Write("Enter employee designation (PM/PrM/TL/SP/JP): ");
                        e.Designation = Console.ReadLine();
                        e.Designation = e.Designation.ToUpper(); // Convert to uppercase for consistency
                        e.Input(d);
                        break;
                    case 2:
                        d.Display();
                        break;
                    case 3:
                        Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("Invalid choice. Please try again.");
                        break;
                }
            }
            else
            {
                Console.WriteLine("Invalid input. Please enter a valid number.");
            }
        } while (choice != 3);
    }
}

class DesignationLists
{
    private List<Employee> PM = new List<Employee>();
    private List<Employee> PrM = new List<Employee>();
    private List<Employee> TL = new List<Employee>();
    private List<Employee> SP = new List<Employee>();
    private List<Employee> JP = new List<Employee>();

    public void Input(Employee e)
    {
        switch (e.Designation)
        {
            case "PM":
                PM.Add(e);
                break;
            case "PRM":
                PrM.Add(e);
                break;
            case "TL":
                TL.Add(e);
                break;
            case "SP":
                SP.Add(e);
                break;
            case "JP":
                JP.Add(e);
                break;
            default:
                Console.WriteLine("Invalid designation. Employee not added.");
                break;
        }
    }

    public void Display()
    {
        Console.WriteLine("Employees:");
        DisplayList(PM);
        DisplayList(PrM);
        DisplayList(TL);
        DisplayList(SP);
        DisplayList(JP);
    }

    private void DisplayList(List<Employee> employees)
    {
        foreach (var employee in employees)
        {
            Console.WriteLine($"Name: {employee.Name}, Designation: {employee.Designation}");
        }
    }
}












using System;

public class MaxMinFinder<T> where T : IComparable<T>
{
    public T FindMax(T a, T b, T c)
    {
        if (a.CompareTo(b) >= 0 && a.CompareTo(c) >= 0)
        {
            return a;
        }
        else if (b.CompareTo(a) >= 0 && b.CompareTo(c) >= 0)
        {
            return b;
        }
        else
        {
            return c;
        }
    }

    public T FindMin(T a, T b, T c)
    {
        if (a.CompareTo(b) <= 0 && a.CompareTo(c) <= 0)
        {
            return a;
        }
        else if (b.CompareTo(a) <= 0 && b.CompareTo(c) <= 0)
        {
            return b;
        }
        else
        {
            return c;
        }
    }
}

class Program
{
    static void Main()
    {
        MaxMinFinder<double> doubleFinder = new MaxMinFinder<double>();

        double num1 = 12.5;
        double num2 = 9.3;
        double num3 = 15.7;

        double max = doubleFinder.FindMax(num1, num2, num3);
        double min = doubleFinder.FindMin(num1, num2, num3);

        Console.WriteLine($"Max: {max}");
        Console.WriteLine($"Min: {min}");
    }
}











using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Queue<Person> seniorCitizenQueue = new Queue<Person>();
        Queue<Person> generalQueue = new Queue<Person>();

        // Input for 6 people
        for (int i = 1; i <= 6; i++)
        {
            Console.Write($"Enter name for Person {i}: ");
            string name = Console.ReadLine();
            Console.Write($"Enter age for Person {i}: ");
            int age = int.Parse(Console.ReadLine());

            Person person = new Person(name, age);

            if (age >= 60)
            {
                seniorCitizenQueue.Enqueue(person);
            }
            else
            {
                generalQueue.Enqueue(person);
            }
        }

        Console.WriteLine("Processing Sequence:");

        while (seniorCitizenQueue.Count > 0)
        {
            Console.WriteLine(seniorCitizenQueue.Dequeue());
            if (generalQueue.Count > 0)
                Console.WriteLine(generalQueue.Dequeue());
        }

        while (generalQueue.Count > 0)
        {
            Console.WriteLine(generalQueue.Dequeue());
        }
    }
}

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }

    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }

    public override string ToString()
    {
        return $"Name: {Name}, Age: {Age}";
    }
}












using System;
using System.Collections;

class Question
{
    public string QuestionName { get; set; }
    public bool CorrectAnswer { get; set; }

    public Question(string questionName, bool correctAnswer)
    {
        QuestionName = questionName;
        CorrectAnswer = correctAnswer;
    }
}

class Paper
{
    public BitArray AnsActual { get; set; }

    public Paper()
    {
        AnsActual = new BitArray(4);
    }
}

class Program
{
    static void Main()
    {
        Question[] questions = new Question[4];
        questions[0] = new Question("Q1: Collection namespace has ICollection interface (T/F):", true);
        questions[1] = new Question("Q2: An IList in C# represents the class List in other languages (T/F):", false);
        questions[2] = new Question("Q3: An Array and any collection is interchangeable object types (T/F):", false);
        questions[3] = new Question("Q4: Collection is a part of BCL in .Net Framework (T/F):", true);

        Paper paper = new Paper();

        Console.WriteLine("Please answer the following questions with 'T' for True or 'F' for False:");

        for (int i = 0; i < questions.Length; i++)
        {
            Console.Write($"{questions[i].QuestionName} ");
            string userAnswerStr = Console.ReadLine();
            bool userAnswer = (userAnswerStr.ToUpper() == "T");
            paper.AnsActual[i] = userAnswer;

            if (userAnswer == questions[i].CorrectAnswer)
            {
                Console.WriteLine("Correct! +5 Marks");
            }
            else
            {
                Console.WriteLine("Incorrect! 0 Marks");
            }
        }

        int totalMarks = paper.AnsActual.Cast<bool>().Count(ans => ans) * 5;
        Console.WriteLine($"Total Marks: {totalMarks} out of 20 marks.");
    }
}









BitArray actual = new BitArray(4);
actual[0] = true;   // Q1: Collection namespace has ICollection interface (True)
actual[1] = false;  // Q2: An IList in C# represents the class List in other languages (False)
actual[2] = false;  // Q3: An Array and any collection is interchangeable object Types (False)
actual[3] = true;   // Q4: Collection is a part of BCL in .Net Framework (True)

BitArray userAnswers = new BitArray(4);

Console.WriteLine("Please answer the following questions with 'T' for True or 'F' for False:");

// Q1
Console.Write("Q1: Collection namespace has ICollection interface (T/F): ");
string q1Answer = Console.ReadLine();
userAnswers[0] = (q1Answer.ToUpper() == "T");

// Q2
Console.Write("Q2: An IList in C# represents the class List in other languages (T/F): ");
string q2Answer = Console.ReadLine();
userAnswers[1] = (q2Answer.ToUpper() == "F");

// Q3
Console.Write("Q3: An Array and any collection is interchangeable object types (T/F): ");
string q3Answer = Console.ReadLine();
userAnswers[2] = (q3Answer.ToUpper() == "F");

// Q4
Console.Write("Q4: Collection is a part of BCL in .Net Framework (T/F): ");
string q4Answer = Console.ReadLine();
userAnswers[3] = (q4Answer.ToUpper() == "T");

// Calculate marks
int totalMarks = 0;
for (int i = 0; i < 4; i++)
{
    if (userAnswers[i] == actual[i])
    {
        totalMarks += 5;
    }
}

Console.WriteLine($"You scored {totalMarks} out of 20 marks.");












using System;

class Employee
{
    public string Name { get; set; }
    public int Age { get; set; }

    public Employee(string name, int age)
    {
        Name = name;
        Age = age;
    }
}

class DuplicateNameException : Exception
{
    public DuplicateNameException(string name)
        : base($"Duplicate Name: {name} (Need double Salary??)")
    {
    }
}

class InvalidAgeException : Exception
{
    public InvalidAgeException(int age)
        : base(age < 18 ? "Children not allowed as an Employee" :
               age > 60 ? "Seniors not allowed as an Employee" :
               age < 0 ? "Ghosts not allowed as an Employee" :
               age > 100 ? "Purvaj not allowed as an Employee" :
               "Invalid Age")
    {
    }
}

class Program
{
    static Employee[] employees = new Employee[100]; // Change the size of the array as needed
    static int employeeCount = 0;

    static void Main(string[] args)
    {
        while (true)
        {
            Console.WriteLine("Menu:");
            Console.WriteLine("1. Enter new Employee");
            Console.WriteLine("2. List the Employees");
            Console.WriteLine("3. Exit");
            Console.Write("Enter your choice: ");
            
            int choice;
            if (int.TryParse(Console.ReadLine(), out choice))
            {
                switch (choice)
                {
                    case 1:
                        EnterNewEmployee();
                        break;
                    case 2:
                        ListEmployees();
                        break;
                    case 3:
                        Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("Invalid choice. Try again.");
                        break;
                }
            }
            else
            {
                Console.WriteLine("Invalid input. Try again.");
            }
        }
    }

    static void EnterNewEmployee()
    {
        try
        {
            Console.Write("Enter Employee Name: ");
            string name = Console.ReadLine();

            if (IsNameDuplicate(name))
            {
                throw new DuplicateNameException(name);
            }

            Console.Write("Enter Employee Age: ");
            int age = int.Parse(Console.ReadLine());

            if (age < 0 || age > 100)
            {
                throw new InvalidAgeException(age);
            }

            if (employeeCount < employees.Length)
            {
                employees[employeeCount++] = new Employee(name, age);
                Console.WriteLine("Employee added successfully.");
            }
            else
            {
                Console.WriteLine("Maximum number of employees reached.");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
            if (ex.InnerException != null)
            {
                Console.WriteLine($"Inner Exception: {ex.InnerException.Message}");
            }
        }
    }

    static bool IsNameDuplicate(string name)
    {
        for (int i = 0; i < employeeCount; i++)
        {
            if (employees[i] != null && employees[i].Name.Equals(name, StringComparison.OrdinalIgnoreCase))
            {
                return true;
            }
        }
        return false;
    }

    static void ListEmployees()
    {
        Console.WriteLine("List of Employees:");
        for (int i = 0; i < employeeCount; i++)
        {
            Console.WriteLine($"Name: {employees[i].Name}, Age: {employees[i].Age}");
        }
    }
}












using System;

class Program
{
    static void Main(string[] args)
    {
        try
        {
            if (args.Length % 2 != 0)
            {
                throw new ArgumentException("The list is not complete");
            }

            int hoursInADay = 8;
            for (int i = 0; i < args.Length; i += 2)
            {
                string topic = args[i];
                if (!int.TryParse(args[i + 1], out int hours))
                {
                    throw new ArgumentException("The list is incorrect");
                }

                int trainingDays = (int)Math.Ceiling((double)hours / hoursInADay);
                Console.WriteLine($"{topic}: {trainingDays} days training");
            }
        }
        catch (ArgumentException ex)
        {
            Console.WriteLine(ex.Message);
        }
        catch (Exception ex)
        {
            Console.WriteLine("An error occurred: " + ex.Message);
        }
    }
}









using System;

// Define the Imylterator interface
public interface Imylterator
{
    int next();
    void begin();
    bool hasNext();
}

// Define the myCollection class
public class myCollection
{
    private int[] arr = new int[10000];
    private int tos = -1;

    public void Add(int i)
    {
        if (tos < 9999)
        {
            tos++;
            arr[tos] = i;
        }
    }

    public Imylterator GetIterator()
    {
        return new myIterator(this);
    }

    // Inner class myIterator that implements Imylterator
    private class myIterator : Imylterator
    {
        private myCollection collection;
        private int nav = -1;

        public myIterator(myCollection collection)
        {
            this.collection = collection;
        }

        public int next()
        {
            if (collection.tos != -1 && nav <= collection.tos)
            {
                int value = collection.arr[nav];
                nav++;
                return value;
            }
            else
            {
                throw new InvalidOperationException("No more elements to iterate.");
            }
        }

        public void begin()
        {
            if (collection.tos >= 0)
            {
                nav = 0;
            }
        }

        public bool hasNext()
        {
            return nav <= collection.tos;
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        myCollection c1 = new myCollection();

        // Adding elements manually
        c1.Add(11);
        c1.Add(22);
        c1.Add(33);

        Imylterator it = c1.GetIterator();
        it.begin();

        while (it.hasNext())
        {
            Console.WriteLine(it.next());
        }
    }
}













using System;

// Define the Operation interface with the 'op' method
interface Operation
{
    int op(int num1, int num2);
}

// Create classes for different mathematical operations
class Sum : Operation
{
    public int op(int num1, int num2)
    {
        return num1 + num2;
    }
}

class Sub : Operation
{
    public int op(int num1, int num2)
    {
        return num1 - num2;
    }
}

class Mul : Operation
{
    public int op(int num1, int num2)
    {
        return num1 * num2;
    }
}

class Div : Operation
{
    public int op(int num1, int num2)
    {
        if (num2 != 0)
        {
            return num1 / num2;
        }
        else
        {
            Console.WriteLine("Error: Division by zero");
            return 0;
        }
    }
}

// Define a MathOperation class that takes two operands and an operation
class MathOperation
{
    private int Operand1;
    private int Operand2;
    private Operation operation;

    public MathOperation(int operand1, int operand2, Operation operation)
    {
        Operand1 = operand1;
        Operand2 = operand2;
        this.operation = operation;
    }

    public void operate()
    {
        int result = operation.op(Operand1, Operand2);
        Console.WriteLine("Result: " + result);
    }
}

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Enter Operand 1:");
        int operand1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter Operand 2:");
        int operand2 = Convert.ToInt32(Console.ReadLine());

        // Create objects of different operation classes
        Operation sumOperation = new Sum();
        Operation subOperation = new Sub();
        Operation mulOperation = new Mul();
        Operation divOperation = new Div();

        // Create MathOperation objects and perform operations
        MathOperation sumMath = new MathOperation(operand1, operand2, sumOperation);
        MathOperation subMath = new MathOperation(operand1, operand2, subOperation);
        MathOperation mulMath = new MathOperation(operand1, operand2, mulOperation);
        MathOperation divMath = new MathOperation(operand1, operand2, divOperation);

        Console.WriteLine("Sum:");
        sumMath.operate();

        Console.WriteLine("Subtraction:");
        subMath.operate();

        Console.WriteLine("Multiplication:");
        mulMath.operate();

        Console.WriteLine("Division:");
        divMath.operate();
    }
}













using System;

class Program
{
    static void Main(string[] args)
    {
        Console.Write("Enter a non-negative integer: ");
        if (int.TryParse(Console.ReadLine(), out int number) && number >= 0)
        {
            long factorial = 1;
            for (int i = 1; i <= number; i++)
            {
                factorial *= i;
            }
            Console.WriteLine($"Factorial of {number} is {factorial}");
        }
        else
        {
            Console.WriteLine("Invalid input. Please enter a non-negative integer.");
        }
    }
}







using System;

class Program
{
    static bool IsPrime(int number)
    {
        if (number <= 1)
            return false;
        if (number <= 3)
            return true;
        if (number % 2 == 0 || number % 3 == 0)
            return false;
        
        for (int i = 5; i * i <= number; i += 6)
        {
            if (number % i == 0 || number % (i + 2) == 0)
                return false;
        }
        
        return true;
    }

    static void Main(string[] args)
    {
        if (args.Length != 2)
        {
            Console.WriteLine("Error: Please provide exactly two integer arguments.");
            return;
        }

        if (int.TryParse(args[0], out int num1) && int.TryParse(args[1], out int num2))
        {
            int start = Math.Min(num1, num2);
            int end = Math.Max(num1, num2);

            if (start <= end)
            {
                for (int i = start; i <= end; i++)
                {
                    if (IsPrime(i))
                        Console.Write(i + (i == end || i == end - 1 ? "" : ", "));
                }
            }
            else
            {
                for (int i = start; i >= end; i--)
                {
                    if (IsPrime(i))
                        Console.Write(i + (i == end || i == end + 1 ? "" : ", "));
                }
            }
            
            Console.WriteLine();
        }
        else
        {
            Console.WriteLine("Error: Both arguments must be valid integers.");
        }
    }
}











using System;

class Program
{
    static void Main()
    {
        // Define correct username and password
        string correctUsername = "Monica";
        string correctPassword = "Gupta";

        int attempts = 3;
        bool loggedIn = false;

        Console.WriteLine("Welcome to the Login Program");

        while (attempts > 0 && !loggedIn)
        {
            Console.Write("Username: ");
            string username = Console.ReadLine();
            Console.Write("Password: ");
            string password = Console.ReadLine();

            if (username == correctUsername && password == correctPassword)
            {
                loggedIn = true;
                Console.WriteLine("Welcome, Monica!");
            }
            else
            {
                attempts--;
                Console.WriteLine($"Incorrect username or password. {attempts} attempts remaining.");
            }
        }

        if (!loggedIn)
        {
            Console.WriteLine("You have exceeded the maximum number of login attempts. Press Enter to exit.");
            Console.ReadLine(); // Wait for Enter key press to exit
        }
    }
}











using System;

class Program
{
    static void Main()
    {
        // Declare an integer array of 6 elements
        int[] arr = new int[6];

        // Take 6 elements from the user as input
        for (int i = 0; i < 6; i++)
        {
            Console.Write($"Enter element {i + 1}: ");
            arr[i] = Convert.ToInt32(Console.ReadLine());
        }

        // 1. Find the maximum and minimum from the array and print them
        int maxNum = arr[0];
        int minNum = arr[0];

        foreach (int num in arr)
        {
            if (num > maxNum)
                maxNum = num;
            if (num < minNum)
                minNum = num;
        }

        Console.WriteLine($"Maximum: {maxNum}");
        Console.WriteLine($"Minimum: {minNum}");

        // 2. Print all even numbers from the array
        Console.Write("Even numbers: ");
        foreach (int num in arr)
        {
            if (num % 2 == 0)
                Console.Write(num + " ");
        }
        Console.WriteLine();

        // 3. Print the square of each element of the array
        Console.Write("Squared elements: ");
        foreach (int num in arr)
        {
            int square = num * num;
            Console.Write(square + " ");
        }
        Console.WriteLine();
    }
}













import java.util.Scanner;

// Base class representing the MainOS
class MainOS {
    protected boolean mouseOperable;
    protected String desktop;
    protected String fileManager;

    public MainOS() {
        mouseOperable = true;
        desktop = "Default Desktop";
        fileManager = "Default File Manager";
    }

    public void displayFeatures() {
        System.out.println("Mouse operable: " + mouseOperable);
        System.out.println("Desktop: " + desktop);
        System.out.println("File Manager: " + fileManager);
    }
}

// Derived class for Windows OS
class WinOS extends MainOS {
    private String cmd;

    public WinOS() {
        cmd = "Command Prompt";
    }

    @Override
    public void displayFeatures() {
        super.displayFeatures();
        System.out.println("Command Line Interface: " + cmd);
    }
}

// Derived class for Linux OS
class LinuxOS extends MainOS {
    private String terminal;

    public LinuxOS() {
        terminal = "Terminal";
    }

    @Override
    public void displayFeatures() {
        super.displayFeatures();
        System.out.println("Terminal: " + terminal);
    }
}

// Derived class for MacOS
class MacOS extends MainOS {
    private String terminal;

    public MacOS() {
        terminal = "Terminal";
    }

    @Override
    public void displayFeatures() {
        super.displayFeatures();
        System.out.println("Terminal: " + terminal);
    }
}

// Class representing a Dell laptop
class DellLaptop {
    private MainOS os;

    public DellLaptop(MainOS os) {
        this.os = os;
    }

    public void displayFeatures() {
        System.out.println("Dell Laptop Features:");
        os.displayFeatures();
    }
}

public class OperatingSystemMenu {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int choice;

        do {
            System.out.println("Welcome to Dell Laptop OS selection:");
            System.out.println("1. Windows OS");
            System.out.println("2. Linux OS");
            System.out.println("3. MacOS");
            System.out.println("4. Exit");
            System.out.print("Enter your choice: ");

            choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    DellLaptop winLaptop = new DellLaptop(new WinOS());
                    winLaptop.displayFeatures();
                    break;
                case 2:
                    DellLaptop linuxLaptop = new DellLaptop(new LinuxOS());
                    linuxLaptop.displayFeatures();
                    break;
                case 3:
                    DellLaptop macLaptop = new DellLaptop(new MacOS());
                    macLaptop.displayFeatures();
                    break;
                case 4:
                    System.out.println("Exiting the program.");
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }
        } while (choice != 4);

        scanner.close();
    }
}