namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
 
            Console.WriteLine("Enter the number that you want to convert to Hexadecimal ");
            int n = int.Parse(Console.ReadLine());
 
            Console.Write("{0}=",n);
            ToHexadecimal(n);
            Console.ReadKey();
 
        }
        static void ToHexadecimal(int n)
        {
            if (n == 0)
                return;
            else
            {
                int r = n % 16;
                n =n/ 16;
                ToHexadecimal(n);
 
 
                switch (r)
                {
                    case 10:
                        Console.Write("A");
                        break;
                    case 11:
                        Console.Write("B");
                        break;
                    case 12:
                        Console.Write("C");
                        break;
                    case 13:
                        Console.Write("D");
                        break;
                    case 14:
                        Console.Write("E");
                        break;
                    case 15:
                        Console.Write("F");
                        break;
                    default:
                        Console.Write(r);
                        break;
 
                }
 
            }
        }
 
    }
}