using System;

public class Program

{

    static double EaseInOutExpo(double from, double to, double elapsed, double duration)

    {

        var change = to - from;

        var elapsedMilliseconds = elapsed;

​

/*        if (elapsedMilliseconds == 0)

        {

            return from;

        }

        else if (elapsedMilliseconds >= duration)

        {

            return to;

        }

        else*/ if ((elapsedMilliseconds /= duration / 2) < 1)

        {

            return change / 2 * Math.Pow(2, 10 * (elapsedMilliseconds - 1)) + from;

        }

        else if (elapsed < duration)

        {

            return change / 2 * (-Math.Pow(2, -10 * --elapsedMilliseconds) + 2) + from;

        }

​

        return to;

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var iterations = 1000000000.0;

        for(var i = 0; i < iterations + 1; i++) {

            Console.WriteLine(i + ": " + EaseInOutExpo(0.0, 1.0, i / iterations, 1.0));

        }

    }

}