using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {       

        Random random = new Random();       

        //double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };

        var doubles = Enumerable.Range(0, 1000).Select(r => random.NextDouble());

        Console.WriteLine("{0}", string.Join("\n", doubles.ToList()));

        Console.WriteLine();

        var doublesSummed  = doubles.Skip(1).Aggregate(

            new {

                sum = doubles.First(),

                doubles = new [] {doubles.First()}.AsEnumerable()

            },  

            (acc, nextDouble) => new {

                sum = acc.sum + nextDouble,

                doubles = acc.doubles.Append(acc.sum + nextDouble)

            }

        );

        Console.WriteLine("{0}", string.Join("\n", doublesSummed.doubles.ToList()));

    }

}