05. Applied Arithmetics / 2 variants in one

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection.Metadata;

namespace _5._Applied_Arithmetics
{
    class Program
    {
        static void Main(string[] args)
        {
            //---------------------------- VARIANT TYPE 1-------------------------------------------
            //---------- Using ternary operator-----------------------------------------

            //List<int> numbers = new List<int>(Console.ReadLine().Split().Select(int.Parse).ToList());

            //Func<List<int>, string, List<int>> func = (collection, filter) =>
            //        (filter == "add" ? collection.Select(n => n += 1) :
            //        filter == "subtract" ? collection.Select(n => n -= 1) :
            //        collection.Select(n => n *= 2)).ToList();

            //Action<List<int>> print = collection =>
            //{
            //    Console.WriteLine(string.Join(" ", collection));
            //};

            //string command = Console.ReadLine();
            //while (command?.ToLower() != "end")
            //{
            //    switch (command)
            //    {
            //        case "add":
            //        case "subtract":
            //        case "multiply":
            //            numbers = func(numbers, command);
            //            break;
            //        case "print":
            //            print(numbers);
            //            break;
            //    }

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

            List<int> numbers = new List<int>(Console.ReadLine().Split().Select(int.Parse).ToList());

            Action<List<int>> print = collection =>
            {
                Console.WriteLine(string.Join(" ", collection));
            };

            string command = Console.ReadLine();
            while (command?.ToLower() != "end")
            {
                switch (command)
                {
                    case "add":
                        numbers = ForEach(numbers, n => n += 1);
                        break;
                    case "subtract":
                        numbers = ForEach(numbers, n => n -= 1);
                        break;
                    case "multiply":
                        numbers = ForEach(numbers, n => n *= 2);
                        break;
                    case "print":
                        print(numbers);
                        break;
                }
                command = Console.ReadLine();
            }
        }
        public static List<int> ForEach(List<int> numbers, Func<int, int> func) => (numbers.Select(number => func(number)).ToList());
    }
}