using System;

public class Vehicle

{

    public string Make {get;set;}

    public string Model {get;set;}

    public string SerialNum {get;set;}

    private int _price;

    public int Price

    {

        get

        {

            return _price;

        }

        set

        {

            if(value < 8000)

            {

                _price = 8000;

            }

            else

            {

                _price = value;

            }

        }

    }

    public Vehicle()

    {

    }

    public Vehicle(string make, string model, int price, string serialnum)

    {

        Make = make;

        Model = model;

        _price = price;

        SerialNum = serialnum;

    }

    public virtual string DisplayInfo()

    {

        return ("Vehicle");

    }

    public bool VerifySerialNum()

    {

        if (SerialNum.StartsWith("A1") == true)

        {

            return true;

        }

        else

        {

            return false;

        }

    }

}

​

public class Car : Vehicle{

    public int SeatCapacity{get;set;}

    public Car()

    {

    }

    public Car(string make, string model, int price, string serialnum, int seatcapacity) : base (make, model, price, serialnum)

    {

        SeatCapacity = seatcapacity;

    }

    public override string DisplayInfo()

    {

        if (SeatCapacity >= 6)

        {

            return ("Large Car");

        }

        else if (SeatCapacity >= 4)

        {

            return ("Regular Car");

        }

        else

        {

            return ("Small Car");

        }

    }

}