using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

//      String BinAllow = "10";

//      int BinAllow2 = Convert.ToInt32(BinAllow);

        Console.WriteLine(@"

=====================

Binary to denary = 1

Denary to binary = 2

=====================");

        string Choice = Console.ReadLine();

            if (Choice == "1")

            {

                Console.WriteLine("Please enter your binary number: ");

                string Bin = Console.ReadLine();

    //          int Bin2 = Convert.ToInt32(Bin);

                while(Bin.Length == 8)

                {

                    List<int> BinList = new List<int>();

                    foreach (char c in Bin)

                    {   

                        int c2 = Convert.ToInt32(c)-48;

                        BinList.Add(c2);

                    }

                    foreach (int i in BinList)

                    {

        //              Console.WriteLine(i);

                    }

                    double Answer = 0;

                    int n = 7;

                    while (n >= 0 && n <= 7)

                    {

                            if(BinList[n] == 1)

                            {

                                Answer += Math.Pow(2.0, 7.0-n);

                                n-= 1;

        //                      Console.WriteLine("We found 1");

        //                      Console.WriteLine(Answer);

                            }

                            else

                            {

                                Answer += 0;

                                n-= 1;

        //                      Console.WriteLine("We found 0");

        //                      Console.WriteLine(n);

        //                      Console.WriteLine("n is: ");

                            }

                    }

                    Console.WriteLine("The answer is: {0}", Answer);

                    break;

                }

            }

    //          Console.WriteLine("The answer is: {0}", Answer);

            if (Choice == "2")

            {

                Console.WriteLine("Please enter your denary number");

                String Deccy2 = Console.ReadLine();

                int Deccy = Convert.ToInt32(Deccy2);

                if(Deccy >= 0 && Deccy < 256)

                {   

                    List<int> BinList = new List<int>();

                    int n = 8;

                    int bby = 128;

                    while(n > 0)

                    {

                        if(Deccy >= bby)

                        {

    //                      int Bit = Something;

                            Deccy -= bby;

                            bby /= 2;

                            BinList.Add(1);

    //                      int Remainder = Deccy / 2; 

    //                      Console.WriteLine(Remainder);

                            n -= 1;

    //                      Console.WriteLine("{1} does go into {0}", Deccy, bby);

    //                      Console.WriteLine("n is : {0}", n);

    //                      BinList.Add(Remainder);

    //                      Console.WriteLine(Remainder);

                        }

                        if (Deccy < bby)

                        {

                            bby /= 2;

                            BinList.Add(0);

                            n -= 1;

    //                      Console.WriteLine("{0} does not go into {1}", Deccy, bby);

                        }

                    }

                    foreach (int x in BinList)

                    {

                        Console.Write("{0}", x);

                    }

                }

                else

                {

                    Console.WriteLine("invalid number");

                }

            }

    }

}