Chapter 9 Solution???

sweet_p12 · October 9th, 2003, 05:47 PM

Does anyone have a sample of what the correct code should look like for Q5 in Chapter 9?

Chris Beach · October 10th, 2003, 10:05 AM

Code:

Car object1=new Car.Compact();
Car object2=new Car.Pickup();
Car object3=new Car.SUV();
Train object4=new Train.DoubleBogey();
Train object5=new Train.Freight();
Train object6=new Train.Passenger();
Console.WriteLine(object1.ToString());
Console.WriteLine(object2.ToString());
Console.WriteLine(object3.ToString());
Console.WriteLine(object4.ToString());
Console.WriteLine(object5.ToString());
Console.WriteLine(object6.ToString());

Is what I've got, with refrence a to Ch09Q04 which is:

Code:

using System;

namespace Vehicle
{
    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    /// 
    public interface IPassengerCarrier
    {
    }

    public interface IHeavyLoadCarrier
    {
    }

    public class Vehicle
    {
        public Vehicle()        //constuctor
        {
        }
    }

    public class Car:Vehicle
    {
        public class Compact:Car,IPassengerCarrier
        {
        }

        public class SUV:Car,IPassengerCarrier
        {
        }

        public class Pickup:Car,IPassengerCarrier,IHeavyLoadCarrier
        {
        }
    }

    public class Train:Vehicle
    {
        public class Passenger:Train,IPassengerCarrier
        {
        }

        public class Freight:Train,IHeavyLoadCarrier
        {
        }

        public class DoubleBogey:Train
        {
        }

    }
}

Which looks about right:)

sweet_p12 · October 15th, 2003, 05:15 PM

Thanks, although that is good for number 4, it still doesn't help me much with number 5

Chris Beach · October 16th, 2003, 04:47 AM

code for 5 is at the top, but of course that makes no sense without 4 which is at the bottom.

andresaw · November 19th, 2003, 11:06 PM

Hi. i don't understand Q(5) of Chapter 9, to include AddPassenger () function. Pls anyone help me. Thx.

Imar · November 20th, 2003, 06:09 AM

Hi there,

Not everyone has the book, so maybe you can post the question and some context as well. You could also decide to start a new thread, so your question gets a bit more exposure than when you continue an old thread.

Cheers,

Imar

---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

DanF · March 9th, 2004, 05:24 AM

Public class Vehicle
Public class Car
Public class Train

should be:

Public abstract class Vehicle
Public abstract class Car:Vehicle
Public abstract class Train:Vehicle

As the UML diagram uses italic writing for these headings; they cannot be instantiated, only inherited.

usmayo3rd · September 18th, 2006, 07:51 PM

I know DanF is correct, here is what I did:

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

namespace Vehicles
{
    public abstract class Vehicle
    {
    }

    public interface IPassengerCarrier
    {
        int AddPassengers();
    }

    public interface IHeavyLoadCarrier
    {
    }

    public abstract class Car : Vehicle
    {
    }

    public abstract class Train : Vehicle
    {
    }

    public class Compact : Car, IPassengerCarrier
    {
        public int AddPassengers()
        {
            return 2;
        }
    }

    public class Pickup : Car, IPassengerCarrier, IHeavyLoadCarrier
    {
        public int AddPassengers()
        {
            return 4;
        }
    }

    public class SUV : Car, IPassengerCarrier
    {
        public int AddPassengers()
        {
            return 6;
        }
    }
    public class PassengerTrain : Train, IPassengerCarrier
    {
        public int AddPassengers()
        {
            return 8;
        }
    }

    public class FreightTrain : Train, IHeavyLoadCarrier
    {
    }

    public class DoubleBogey : Train, IHeavyLoadCarrier
    {
    }
}

Then for the finishing code, I added a simple function to return an int value of passengers:

using System;
using System.Collections.Generic;
using System.Text;
using Vehicles;

namespace Traffic
{
    class Program
    {
        static void Main(string[] args)
        {
            Compact chevyChevette = new Compact();
            Pickup nissanFrontier = new Pickup();
            SUV chryslerTrailBlazer = new SUV();
            PassengerTrain myPassengerTrain = new PassengerTrain();

            int objA = chevyChevette.AddPassengers();
            int objB = nissanFrontier.AddPassengers();
            int objC = chryslerTrailBlazer.AddPassengers();
            int objD = myPassengerTrain.AddPassengers();

            Console.WriteLine("My Chevette can carry {0} passengers.\n", objA.ToString());
            Console.WriteLine("My Frontier can carry {0} passengers.\n", objB.ToString());
            Console.WriteLine("My Trail Blazer can carry {0} passengers.\n", objC.ToString());
            Console.WriteLine("My Train can carry {0} passengers.\n", objD.ToString());
        }
    }
}

usmayo3rd · September 19th, 2006, 11:17 AM

Is there a better way to code my above sample?

I don't think the code Chris Beach will work if Vehicle, Car and Train are 'abstract' classes.