decimaltobinarynumber

using System;

class DecimalToBinaryNumber
{
    static void Main()
    {
        Console.Write("Enter a decimal number : ");
        long num = long.Parse(Console.ReadLine());

        string finalNumber = " ";
        while (num > 0)
        {
            if (num % 2 == 0)
            {
                finalNumber += '0';
                num = num / 2;
            }
            else
            {
                finalNumber += '1';
                num = num / 2;
            }

        }

        Console.WriteLine(finalNumber);
    }
}