ArrManupulator

/*
 * Created by SharpDevelop.
 * User: DVasilev
 * Date: 2017/06/09
 * Time: 2:41 PM
 *
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.Linq;
using System.Collections.Generic;


namespace ArrManipulator
{
    class Program
    {
        public static void Main(string[] args)
        {
            //Console.WriteLine("Hello World!");

            List<double> inputNums = Console.ReadLine().Split(' ').Select(x=>double.Parse(x)).ToList();
            ManipulateArray(inputNums);
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
        public static void ManipulateArray(List<double> inputNums)
        {
            string input = Console.ReadLine().ToLower();
            int index = 0;
            double element = 0;
            double end = inputNums.Count;
            while (input != "print")
            {
                switch (input)
                {
                    case"add":
                        index = int.Parse(Console.ReadLine());
                        element = double.Parse(Console.ReadLine());
                        inputNums.Insert(index,element);
                        break;
                    case"addmany":
                        index = int.Parse(Console.ReadLine());
                        for (int i = 0; i < inputNums.Count; i++)
                        {
                            double insertEl = double.Parse(Console.ReadLine());
                            inputNums.Insert(index,insertEl);
                        }
                        break;
                    case"contains":
                        element = double.Parse(Console.ReadLine());
                        for (int i = 0; i < inputNums.Count; i++) {
                            if (inputNums[i] == element)
                            {
                                Console.WriteLine(i);
                            }
                            else
                            {
                                Console.WriteLine(-1);
                            }
                        }
                        break;
                    case"remove":
                        index = int.Parse(Console.ReadLine());
                        inputNums.Remove(inputNums[index]);
                        break;
                    case"shift":
                        index = int.Parse(Console.ReadLine());
                        var result = inputNums.Skip(index).ToList();
                        for (int i = 0; i < index; i++)
                        {
                            result.Add(inputNums[i]);
                            inputNums = result;
                        }
                        break;
                    case"sumpairs":
                        List<double> sums = new List<double>();
                            if (inputNums.Count % 2 != 0)
                            {
                                end = inputNums.Count - 1;
                            }
                            if (inputNums.Count % 2 != 0)
                            {
                                sums.Add(inputNums.Last());
                            }
                            inputNums = sums;
                        for (int i = 0; i < end; i++)
                        {
                            sums.Add(inputNums[i]+inputNums[i+1]);
                            i++;
                        }
                        break;
                    case"print":
                        Console.WriteLine("[" + string.Join(", ", inputNums) + "]");
                        break;
                    default:
                        Console.WriteLine("Default");
                        break;
                }
            }

        }
    }
}