using System;

​

class Program

{

    public static void Main()

    {

        Sequence();

        Selection();

        Repetition();

        LinearSearch();

    }

​

    public static void Sequence()

    {

        int Numb1 = 7;

        int Numb2 = 9;

        Console.WriteLine("The answer is " + (Numb1 + Numb2));

        Console.WriteLine();

    }

​

    public static void Selection()

    {

        Console.WriteLine("What is the temperature of the water?");

        float temp = Convert.ToInt16(Console.ReadLine());

        if (temp >= 100)

        {

            Console.WriteLine("This is a gas");

        }

        else if (temp <= 0)

        {

            Console.WriteLine("This is a solid");

        }

        else

        {

            Console.WriteLine("This is a liquid");

        }

    }

​

    public static void Repetition()

    {

        Console.WriteLine();

        Console.WriteLine("The array numbers are : ");

        int[] Numb = { -5, 3, 7, 2, 9 };

        int ArrayNumb = 0;

        while (ArrayNumb < Numb.Length)

        {

            Console.WriteLine(Numb[ArrayNumb]);

            ArrayNumb = ArrayNumb + 1;

        }

    }

​

    public static void LinearSearch()

    {

        Console.WriteLine();

        Console.Write("Enter a number between 1 and 1000: ");

        int userNumber;

        // Validate user input

        while (!int.TryParse(Console.ReadLine(), out userNumber) || userNumber < 1 || userNumber > 1000)

        {

            Console.WriteLine();

            Console.WriteLine();

            Console.Write("Invalid input. Please enter a number between 1 and 1000: ");

        }

​

        Console.WriteLine();

        Random rand = new Random();

        int count = rand.Next(1, 1001); // Random number to determine how many numbers to generate

        Console.WriteLine($"The computer chose to generate {count} random numbers.");

        int[] numbers = new int[count];

        // Generate random numbers

        for (int i = 0; i < numbers.Length; i++)

        {

            numbers[i] = rand.Next(1, 1001);

        }

        Console.WriteLine();

        // Display generated numbers

        Console.WriteLine("The computer chose the following numbers:");

        foreach (int num in numbers)

        {

            Console.Write(num + " ");

        }

​

        bool found = Array.Exists(numbers, num => num == userNumber);

        Console.WriteLine();

        if (found)

        {

            Console.WriteLine();

            Console.WriteLine($"Your number {userNumber} was found in the random numbers!");

        }

        else

        {

            Console.WriteLine();

            Console.WriteLine($"Sorry, your number {userNumber} was not found.");

        }

    }

}

​