Zodiac

using System;
using System.Collections.Generic;
using System.IO;

namespace Zodiac
{
    public struct ZodiacSign
    {
        public string Name { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }

        public ZodiacSign(string name, DateTime startDate, DateTime endDate)
            : this()
        {
            Name = name;
            StartDate = startDate;
            EndDate = endDate;
        }
    }

    class Program
    {
        static readonly ZodiacSign[] ZodiacSigns = new[]
        {
            new ZodiacSign(
                "Sagittarius",
                new DateTime(2016, 11, 22),
                new DateTime(2016, 12, 21)),
            new ZodiacSign(
                "Capricorn",
                new DateTime(2016, 12, 22),
                new DateTime(2016, 1, 19))
        };

        const string DataFile = "../../dates.txt";

        static void Main(string[] args)
        {
            var dates = ReadDates(DataFile);

            foreach (var date in dates)
            {
                PrintZodiacSign(date);
            }
        }

        private static void PrintZodiacSign(DateTime date)
        {
            var comparisonDate = new DateTime(2016, date.Month, date.Day);

            foreach (var zodiacSign in ZodiacSigns)
            {
                if (zodiacSign.Name != "Capricorn")
                {
                    if (comparisonDate >= zodiacSign.StartDate
                        && comparisonDate <= zodiacSign.EndDate)
                    {
                        Console.WriteLine("{0} => {1}",
                            date.ToShortDateString(),
                            zodiacSign.Name);
                    }
                }
                else
                {
                    if (comparisonDate >= zodiacSign.StartDate
                        || comparisonDate <= zodiacSign.EndDate)
                    {
                        Console.WriteLine("{0} => {1}",
                            date.ToShortDateString(),
                            zodiacSign.Name);
                    }
                }
            }
        }

        private static IList<DateTime> ReadDates(string dataFile)
        {
            var dateList = new List<DateTime>();

            using (var reader = new StreamReader(dataFile))
            {
                string line = reader.ReadLine();
                while (line != null)
                {
                    DateTime date;

                    if (DateTime.TryParse(line, out date))
                    {
                        dateList.Add(date);
                    }

                    line = reader.ReadLine();
                }
            }

            return dateList;
        }
    }
}