using System;

public class Program

{

    public static void Main()

    {

        //1.1

        Console.Write("Do you want to stop? (y/n): ");

        string ans = Console.ReadLine();

        while (ans == "n")

        {

            Console.Write("Do you want to stop? (y/n): ");

            ans = Console.ReadLine();

        }

        Console.WriteLine("Loop has ended.");

        //1.2

        ///for (int i = 1; i > 0; i++)

        //{

        //  Console.Write("Please type a number: ");

        //  int a = int.Parse(Console.ReadLine());

        //  i = i -1 + a ;

        //  Console.WriteLine(i);

        //}

        //1.3

        Console.Write("Please type a number: ");

        int num = int.Parse(Console.ReadLine());

        Console.Write("Do you want to stop? (y/n): ");

        string b = Console.ReadLine();

        while (b == "n")

        {

            Console.Write("Please type a number: ");

            num += int.Parse(Console.ReadLine());

            Console.Write("Do you want to stop? (y/n): ");

            b = Console.ReadLine();

        }

        if (b == "y")

        {

            Console.WriteLine("Your total is " + num + ".");

        }

        //1.4

        Console.Write("Please type a number: ");

        int ab = int.Parse(Console.ReadLine());

        if (ab > 1)

        {

            for (int i = 0; i <= ab; i++)

            {

                Console.WriteLine(i);

            }

        }

        else

        {

            Console.WriteLine("Type a number greater than 1!"); 

        }

        //1.5

        int c;

        Console.Write("Please type a number: ");

        c = int.Parse(Console.ReadLine());

        if (c > 1)

        {

            int ib = 0;

            while (c > ib)

            {

                Console.WriteLine(c--);

                c--;

            }

        }

        else

        {

            Console.WriteLine("Type a number greater than 1!"); 

        }

    }

}

​