Functional Programming - 05. Applied Arithmetics

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace CSharpAdvanced
{

    class Program
    {
        static void Main(string[] args)
        {
            var numbers = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToList();

            Func<int, int> funcAdd = n => n + 1;
            Func<int, int> funcMultiply = n => n * 2;
            Func<int, int> funcSubtract = n => n - 1;

            Action<List<int>> printAction = n => Console.WriteLine(string.Join(" ", n));

            while (true)
            {
                var command = Console.ReadLine();

                if (command == "end")
                {
                    break;
                }

                switch (command)
                {
                    case "add":
                        numbers = numbers.Select(n => funcAdd(n)).ToList();
                        break;

                    case "multiply":
                        numbers = numbers.Select(n => funcMultiply(n)).ToList();
                        break;

                    case "subtract":
                        numbers = numbers.Select(n => funcSubtract(n)).ToList();
                        break;

                    case "print":
                        printAction(numbers);
                        break;
                }
            }
        }
    }
}