using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(123); //print 123 as a decimal number

        Console.WriteLine(Convert.ToString(123, 2)); //converts number to binary, then print it: 1111011

        Console.WriteLine(Convert.ToString(123, 16)); //converts number to hex, then print it: 7b

        Console.WriteLine(0b1101); //converts number 1101 (binary) to decimal(default), print it: 13

        Console.WriteLine(0x1f); //converts number 1F (hex) to decimal(default) and prints it: 31

        Console.WriteLine(Convert.ToString(0b11110001, 16)); //converts binary to hex then print it: f1

        Console.WriteLine(Convert.ToString(0xf1, 2)); //converts hex to binary then print it: 11110001

        Console.WriteLine(" ");

        Console.WriteLine("converts number (binary) to decimal");

        Console.WriteLine(" ");

        Console.WriteLine(0b0);

        Console.WriteLine(0b1);

        Console.WriteLine(0b10);

        Console.WriteLine(0b101);

        Console.WriteLine(0b1100);

        Console.WriteLine(0b1111);

        Console.WriteLine(" ");

        Console.WriteLine("converts decimal to binary");

        Console.WriteLine(" ");

        Console.WriteLine(Convert.ToString(3, 2));

        Console.WriteLine(Convert.ToString(5, 2));

        Console.WriteLine(Convert.ToString(7, 2));

        Console.WriteLine(Convert.ToString(8, 2));

        Console.WriteLine(Convert.ToString(13, 2));

        Console.WriteLine(Convert.ToString(32, 2));

        Console.WriteLine(" ");

        Console.WriteLine("Convert from hex to decimal:");

        Console.WriteLine(" ");

        Console.WriteLine(0x7);

        Console.WriteLine(0xa);

        Console.WriteLine(0xf);

        Console.WriteLine(0x10);

        Console.WriteLine(0x2f);

        Console.WriteLine(0xfb);

        Console.WriteLine(" ");

        Console.WriteLine("Convert from decimal to hex: 6");

        Console.WriteLine(" ");

        Console.WriteLine(Convert.ToString(64, 16));

        Console.WriteLine(Convert.ToString(30, 16));

        Console.WriteLine(Convert.ToString(16, 16));

        Console.WriteLine(Convert.ToString(20, 16));

        Console.WriteLine(Convert.ToString(7, 16));

        Console.WriteLine(" ");

        Console.WriteLine("Convert from binary directly to hex:");

        Console.WriteLine(" ");

        Console.WriteLine(Convert.ToString(0b1100, 16));

        Console.WriteLine(Convert.ToString(0b10111111, 16));

        Console.WriteLine(Convert.ToString(0b10000001, 16));

    }

}