Group41

using System;

namespace Tester
{
    class Program
    {
        static void Main(string[] args)
        {
            //This program will derive the day of the week for todays date (DateTime.Now.Day) and output this as Mon-Sun as per the array below.

            Console.WriteLine("The following are results of the 4 sections of equations"); //An outut to help show whats on the console.

            string[] DaysOfTheWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }; //Array used as output for days of week

            int Day = DateTime.Now.Day; //Sets int day as todays date
            Console.WriteLine($"Day = {Day}"); //Writes this out to concole This is only done to help see the formula work

            int Month = ((DateTime.Now.Month + 9) % 12) + 1;
            Console.WriteLine($"Month = {Month}");//Writes this out to concole This is only done to help see the formula work

            int YearsInCentury = Month > 10 ? //See http://mathforum.org/dr.math/faq/faq.calendar.html on why this is 10.
                (DateTime.Now.Year - 1) % 100 :
                DateTime.Now.Year % 100;
            Console.WriteLine($"Years in Century = {YearsInCentury}");//Writes this out to concole This is only done to help see the formula work

            int Century = YearsInCentury == 99 && Month > 10 ?
                (DateTime.Now.Year - 100) / 100 :
                DateTime.Now.Year / 100;
            Console.WriteLine($"Century = {Century}");//Writes this out to concole This is only done to help see the formula work

            int DayOfWeek = ((((int)((2.6 * (float)Month) - 0.2)
                + Day + YearsInCentury + (YearsInCentury / 4)
                + (Century / 4) - (2 * Century))) % 7);

            Console.WriteLine($"\nThe day of the week is: {DaysOfTheWeek[DayOfWeek]}");
            Console.Read();

        }
    }
}