using System;

public class Program

{

    public static void Main()

    {

​

        var doubles = new []{2.5m, 3.5m, 4.5m, -2.5m, -3.5m, -4.5m};

        Console.WriteLine("Round Test - ToEven (Default Mode)");

        Console.WriteLine("-------------------------");

        foreach(var d in doubles){

            Console.WriteLine("Round '{0}' results in '{1}'", d, Math.Round(d));

        }   

        Console.WriteLine("\r\n\r\nRound Test - AwayFromZero");

        Console.WriteLine("-------------------------");

        foreach(var d in doubles){

            Console.WriteLine("Round '{0}' results in '{1}'", d, Math.Round(d, MidpointRounding.AwayFromZero));

        }

        Console.WriteLine("\r\n\r\nConvert.ChangeType uses default rounding");

        Console.WriteLine("-------------------------");

        foreach(var d in doubles){

            Console.WriteLine("Convert.ChangeType '{0}' to int results in '{1}'", d, Convert.ChangeType(d, typeof(int)));

        }

        Console.WriteLine("\r\n\r\nCast always rounds down");

        Console.WriteLine("-------------------------");

        foreach(var d in new []{5.9, 1.9, -5.9, -1.9}){

            Console.WriteLine("Cast '{0}' to int results in '{1}'", d, (int)d);

        }

    }

    /*

        Javascript:

        var doubles = [ 2.5, 3.5, 4.5, -2.5, -3.5, -4.5 ]; 

        doubles.forEach(double => console.log(Math.round(double)));

        https://tio.run/#javascript-v8

    */

}