DecToHex

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

//Write a program to convert decimal numbers to their hexadecimal representation

class DecimalToHexadecimal
{
    static List<char> charList = new List<char>();

    static void Main()
    {
        Console.WriteLine("Enter integer, positive number: ");
        int numberInput = int.Parse(Console.ReadLine());
        DecimalToHex(numberInput);
        Console.Write("0x");
        for (int i = 0; i < charList.Count; i++)
        {
            Console.Write("{0}", charList[charList.Count - (1 + i)]); // reversed printing of the result found
        }
        Console.WriteLine();
    }

    static void DecimalToHex(int number) // recursive function for finding a reversed binary representation
    {
        if (number != 0)
        {
            char addingChar = ' ';
            switch (number % 16)
            {
                case 0: addingChar = '0'; break;
                case 1: addingChar = '1'; break;
                case 2: addingChar = '2'; break;
                case 3: addingChar = '3'; break;
                case 4: addingChar = '4'; break;
                case 5: addingChar = '5'; break;
                case 6: addingChar = '6'; break;
                case 7: addingChar = '7'; break;
                case 8: addingChar = '8'; break;
                case 9: addingChar = '9'; break;
                case 10: addingChar = 'A'; break;
                case 11: addingChar = 'B'; break;
                case 12: addingChar = 'C'; break;
                case 13: addingChar = 'D'; break;
                case 14: addingChar = 'E'; break;
                case 15: addingChar = 'F'; break;
            }
            charList.Add(addingChar);
            number /= 16;
            DecimalToHex(number);
        }
    }
}