DecToHex

using System;
using System.Collections.Generic;

public class Program
{
    public static void Dec2Hex(int num)
    {
        Stack<int> hex = new Stack<int>();
        while (num != 0)
        {
            hex.Push(num % 16);
            num /= 16;
        }

        while (hex.Count != 0)
        {
            int digit = hex.Pop();
            if (digit < 10)
            {
                Console.Write(digit);
            }
            else
            {
                switch (digit)
                {
                    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;
                }
            }
        }
    }
    public static void Main()
    {
        Console.Write("Enter number: ");
        int num = int.Parse(Console.ReadLine());
        Stack<int> hex = new Stack<int>();
        while (num != 0)
        {
            hex.Push(num % 16);
            num /= 16;
        }

        while (hex.Count != 0)
        {
            int digit = hex.Pop();
            if (digit < 10)
            {
                Console.Write(digit);
            }
            else
            {
                switch (digit)
                {
                    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;
                }
            }
        }
    }
}