Разворот числа без циклов

ReverseNumber.cs

using System;
					
public class Program
{
	public static double ReverseNumber(double num, double i) {
    	double div = System.Math.Floor(num / 10);
    	double reverseNum = i * 10 + num % 10;
    	return (num == 0) ? i : ReverseNumber(div, reverseNum);
	}

	public static void Main()
	{
		Console.WriteLine("UniLecs");
		Console.WriteLine(ReverseNumber(12345, 0));
		Console.WriteLine(ReverseNumber(12000345, 0));
	}
}