using System;

using System.Collections.Generic;

​

public class Vehicle {

    //properties

    public string make { get; set; }

    public string model { get; set; }

    public string srlNum { get; set; }

    private int _price;

    public int price {

        get { return _price; }

        set {

            if (value < 8000){

                _price = 8000;

            } else {

                _price = value;

            }

        }

    }

    //constructors

    public Vehicle(){ }

    public Vehicle(string mk, string md, int p, string sn){

        make = mk;

        model = md;

        srlNum = sn;

        price = p;

    }

    //functions

    public virtual string displayInfo(){

        return make + "/" + model + "/" + price.ToString("C2") + "/" + srlNum;

    }

    public bool verifySerialNum(){

        return srlNum.Substring(0, 2) == "A1";

    }   

}

​

public class Car: Vehicle {

    //properties

    public int seatCap { set; get; }

    //constructors

    public Car(){ }

    public Car(string mk, string md, int p, string sn, int sc): base (mk, md, p, sn){

        seatCap = sc;

    }

    //functions

    public override string displayInfo(){

        if (seatCap >= 6){

            return "Large Car";

        }

        if (seatCap >= 4){

            return "Medium Car";

        }

        return "Small Car";

    }

}

​

public class Truck: Vehicle {

    //properties

    public int loadCap { set; get; }

    //constructors

    public Truck(){ }

    public Truck(string mk, string md, int p, string sn, int lc): base (mk, md, p, sn){

        loadCap = lc;

    }

    //functions

    public override string displayInfo(){

        if (loadCap >= 10000){

            return "Large Truck";

        } 

        if (loadCap >= 5000){

            return "Medium Truck";

        }

        return "Small Truck";

    }

}

​

public class Program {

    //vehicle list list

    public List<Vehicle> vehList = new List<Vehicle>();

    public void Main(){

        //vehicle init

        Vehicle v1 = new Car("Tesla", "Model Y", 56690, "A1234", 7);

        Vehicle v2 = new Truck("Ford", "F-250", 34950, "B4322", 8000);

        //add vehicles to list

        vehList.Add(v1);

        vehList.Add(v2);

        //iterate vehicles & print vehicle info

        foreach (Vehicle v in vehList){

            Console.WriteLine(v.make + "/" + v.model + "/" + v.price.ToString("C2") + "/" + v.srlNum);

            Console.WriteLine("Verified Serial Num?: " + v.verifySerialNum().ToString());

            Console.WriteLine("Vehicle Size: " + v.displayInfo());

            Console.WriteLine("==============================");

        }

    }

}

​