05. Applied Arithmetics

using System;
using System.Linq;

namespace _05.AppliedArithmetics
{
    class Program
    {
        private static int[] numbers;
        static void Main()
        {
            numbers = Console.ReadLine().Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse).ToArray();

            string command = Console.ReadLine();
            Action<string> manipulateNums = operation =>
            {
                switch (operation)
                {
                    case "add":
                        numbers = numbers.Select(n => n++).ToArray();
                        break;
                    case "multiply":
                        numbers = numbers.Select(n => n * 2).ToArray();
                        break;
                    case "subtract":
                        numbers = numbers.Select(n => n--).ToArray();
                        break;
                    case "print":
                        Console.WriteLine(string.Join(" ", numbers));
                        break;
                }
            };

            while (command != "end")
            {
                manipulateNums(command);

                command = Console.ReadLine();
            }
        }
    }
}