using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

namespace BinaryDecimal_Converter
{
    class Program
    {
        static void Main(string[] args)
        {
            string binary = "0";
            int number = 0, choice;
            bool errorCheck;

            Console.WriteLine("1) base10 to base2\n2) base2 to base10\n3) stop");
            errorCheck = int.TryParse(Console.ReadLine(), out choice);

            if (errorCheck)
            {
                switch (choice)
                {
                    case 1:
                        Console.Write("Decimal: ");
                        errorCheck = int.TryParse(Console.ReadLine(), out number);

                        if (errorCheck)
                        {
                            binary = Convert.ToString(number, 2);
                            Console.WriteLine("Binary: {0}", binary);
                        }
                        else
                            Console.WriteLine("Unable to Parse");
                        break;

                    case 2:
                        Console.Write("Binary: ");
                        errorCheck = int.TryParse(Console.ReadLine(), out number);
                        binary = number.ToString();

                        if (errorCheck)
                        {
                            number = Convert.ToInt32(binary, 2);
                            Console.WriteLine("Decimal: {0}" , number);
                        }
                        else
                            Console.WriteLine("Unable to Parse");
                        break;
                }

            }
            else
                Console.WriteLine("Unable to Parse");
            Console.ReadKey();

        }
    }
}