using System;

​

public class Program

{

    public static bool PromptYesNO(string prompt)

    {

        Console.WriteLine(prompt);

        string response = Console.ReadLine();

        return response.Equals("yes", StringComparison.OrdinalIgnoreCase);

    }

​

    public static void Main()

    {

        while (true)

        {

            int startingNumber = GetInput("Enter starting number:   ");

            GenerateHailstoneSequence(startingNumber);

            if (!PromptYesNO("Generate another sequence (Yes/No):  "))

                break;

            int columns = GetInput("How many columns?:   ");

            GenerateHailstoneSequenceWithColumns(startingNumber, columns);

            DisplayLargeHailstone(startingNumber);

        }

    }

​

    static int GetInput(string prompt)

    {

        Console.Write(prompt);

        return int.Parse(Console.ReadLine());

    }

​

    static void GenerateHailstoneSequence(int startingNumber)

    {

        Console.WriteLine("hailstone Sequence:   ");

        while (startingNumber != 1)

        {

            Console.WriteLine(startingNumber + "  ");

            startingNumber = (startingNumber % 2 == 0) ? startingNumber / 2 : 3 * startingNumber + 1;

        }

​

        Console.WriteLine(1);

    }

​

    static void GenerateHailstoneSequenceWithColumns(int startingNumber, int columns)

    {

        Console.WriteLine("Hailstone Sequence with {columns} columns:   ");

        int count = 0;

        while (startingNumber != 1)

        {

            Console.Write(startingNumber + " ");

            count++;

            startingNumber = (startingNumber % 2 == 0) ? startingNumber / 2 : 3 * startingNumber + 1;

            if (count % columns == 0)

                Console.WriteLine();

        }

​

        Console.WriteLine(1);

    }

​

    static void DisplayLargeHailstone(int startingNumber)

    {

        int currentNumber = startingNumber;

        int largestHailstone = currentNumber;

        int count = 0;

        while (currentNumber != 1)

        {

            if (currentNumber > largestHailstone)

                largestHailstone = currentNumber;

            currentNumber = (currentNumber % 2 == 0) ? currentNumber / 2 : 3 * currentNumber + 1;

            count++;

        }

    }

}