using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter the day of the year you are curious about.  (A number from 1 to 365.)");

        start:

            string x = Console.ReadLine();

        short day;

        if (short.TryParse(x, out day))

        { //start of code block if the user has entered an appropriate number. 

            if (day > 365 || day < 1)

            {

                Console.WriteLine("Please enter a value between 1 & 365");

                goto start;

            }

​

            int weekday = (day + 5) % 7;

            switch (weekday)

            {

                case 0:

                    Console.WriteLine("This day is a Sunday");

                    break;

                case 1:

                    Console.WriteLine("This day is a Monday");

                    break;

                case 2:

                    Console.WriteLine("This day is a Tuesday");

                    break;

                case 3:

                    Console.WriteLine("This day is a Wednesday");

                    break;

                case 4:

                    Console.WriteLine("This day is a Thursday");

                    break;

                case 5:

                    Console.WriteLine("This day is a Friday");

                    break;

                case 6:

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

                    break;

            }

        } //end of the code block if the user has entered an appropriate number. 

        else //goes with the tryParse

        {Console.WriteLine("Please Enter an appropriate value.");

         goto start;

        }

        Console.WriteLine("Do you want to run the program again? y/n");

        string choice = Console.ReadLine();

        if(choice =="Y" || choice == "y")

            goto start; 

        else

            Console.WriteLine("Thank you for using this program.");     

    }

}