C#

for (int i=0; i<arr.Length / 2; i++)
{
int temp = arr[i];
arr[i] = arr[arr.Length – i – 1];
arr[arr.Length – i – 1] = temp;
}

using System;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Vehicle<Actions> aCar = new Car();  // Error: Cannot Implicitly convert type Car
                                                // to Vehicle<Actions>

            Vehicle<Actions> anAirplane = new Airplane(); // Error: Cannot Implicitly convert type
                                                          // Airplane to Vehicle<Actions>

            List<Vehicle<Actions>> list = new List<Vehicle<Actions>>()
            {
                aCar,
                anAirplane
            };
            
            foreach (var vehicle in list)
            {
                vehicle.actions.ID = "any";
                vehicle.actions.PerformAction();
            }
            Console.WriteLine("Good");
        }
    }


    public interface IVehicle<TActions> where TActions : IActions
    {
        TActions actions { get; set; }
    }
    public class Vehicle<TActions> : IVehicle<TActions> where TActions : Actions
    {
        TActions _actions;
        public TActions actions { get => _actions; set => _actions = value; }
    }
    public class Car : Vehicle<CarActions> 
    {
        public int Wheels { get; set; }
    }

    public class Airplane : Vehicle<AirplaneActions> {}

    public interface IActions
    {
        string ID { get; set; }
        void PerformAction();
    }

    public abstract class Actions : IActions
    {
        public string ID { get ; set; }
        public abstract void PerformAction();
    }


    public class CarActions : Actions
    {
        int speed;
        public override void PerformAction()
        {
            speed = 50;
        }
    }

    public class AirplaneActions : Actions
    {
        int Height;
        public override void PerformAction()
        {
            Height = 5000;
        }
    }
}