How to reverse a number as an integer and not as a string?

Question

I came across a question \"How can one reverse a number as an integer and not as a string?\" Could anyone please help me to find out the answer? Reversal should reverse the

Answer 1

a new one:

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        int i = 234;
        int j = -123;
        Console.WriteLine(reverse(i));
        Console.WriteLine(reverse(j));
    }

    static int reverse(int i)
    {
        int sign = i / Math.Abs(i);
        var abs = string.Concat(Math.Abs(i).ToString().Reverse());
        return int.Parse(abs) * sign;
    }
}

https://dotnetfiddle.net/VGJJFf