using System;

​

public class Program

{

    public static void Main()

    {

        int[] ints = {-5, 10, 3, 6, 2};

        var x = Program.ClosestToZero(ints);

        Console.WriteLine("Closest: {0}", x);

    }

​

    public static int ClosestToZero(int[] ints)

    {

        if (ints == null || ints.Length == 0)

        {

            return 0;

        }

​

        int closest = ints[0];

        foreach (int n in ints)

        {

            if (Math.Abs(n) < Math.Abs(closest) || (Math.Abs(n) == Math.Abs(closest) && n > 0))

            {

                closest = n;

            }

        }

​

        return closest;

    }

}