/*
 * C# Program to Print Binary Equivalent of an Integer using Recursion
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
class Program
{
    public static void Main(string[] args)
    {
        int num;
        prog pg = new prog();
        Console.WriteLine("Enter a decimal number: ");
        num = int.Parse(Console.ReadLine());
        Console.WriteLine("The binary equivalent of num is :");
        pg.binaryconversion(num);
        Console.ReadLine();
    }
}
public class prog
{
    public int binaryconversion(int num)
    {
        int bin;
        if (num != 0)
            {
                bin = (num % 2) + 10 * binaryconversion(num / 2);
                Console.Write(bin);
                return 0;
            }
        else
            {
                return 0;
            }
    }
}

/*

Enter a decimal number:
19
The binary equivalent of num is :
10011