SOExample, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
    var test = new List<int>() { 2, 1, 4, 8 };
    int referenceNumber = 5;
    int closestLowerNumber = 0;
    int closestHigherNumber = 0;

foreach (var val in test.OrderBy(v => v))
    {
        if (val < referenceNumber)
        {
            closestLowerNumber = val;
        }
        else if (val > referenceNumber)
        {
            closestHigherNumber = val;
            break;
        }
    }

Console.WriteLine(string.Format("Closest low: {0}, Closest high: {1}, Distance low: {2}, Distance high: {3}", closestLowerNumber, closestHigherNumber, (referenceNumber - closestLowerNumber), (closestHigherNumber - referenceNumber)));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,22 sec, absolute running time: 0,13 sec, cpu time: 0,11 sec, average memory usage: 14 Mb, average nr of threads: 3, absolute service time: 0,36 sec