program development assistance ? flights info

Question

Hi

For this program you will write a simple class and demonstrate its use doing some straightforward

editing.

Write a class representing an airline flight. A Flight has the following data members:

â?¢ Airline (a string)

â?¢ Flight number (integer, must be > 0)

â?¢ Origin airport (a string, specifically a 3-character airport code)

â?¢ Destination airport (3-character airport code)

â?¢ Departure time (24-hour time, expressed as an integer, e.g. 11:30 AM is 1130, 2:15 PM is

1415).

â?¢ Arrival time (24 hour time, same format as departure time).

You will need a default constructor (one that takes no parameters), which sets all integer variables to 0

and leaves all strings as the empty string. You will also need a constructor that takes the above

parameters, in order. (You can either write 2 constructors or write a single constructor with default

values for all parameters.) Your program will also need getters and setters for all data items. The setter

for the airline should check that the airline code is at least 2 and no more than 4 characters long. The

setter for the arrival and departure airport should check that the airport code is 3 characters long.

Arrival and departure times should be no less than 0 and no greater than 2359. Attempts to set values

that do not meet these standards should result in a brief error message, and the data should not be

changed in the object.

You will also need member functions to read the object's data from an input stream and write it to an

output stream. The output function should write all data on one line, with appropriate spacing between

items for readability.

Your main program will be a menu-driven program with the following options for the user:

1. Add a flight

2. Delete a flight

3. Edit a flight

4. Show all arrivals for one airport

5. Show all departures for one airport

6. List all flights

7. Quit

Option 1 should prompt the user regarding what to enter, then call the method (member function) to

read the data from cin. Option 2 should ask the user for the airline and flight number. If there is no such

flight stored, a brief error message should be displayed; otherwise the flight should be removed. Option

3 should ask the user for the airline and flight number; if no such flight is stored, print a brief error

message; otherwise use the member function to print the flight's data to cout, then ask the user to enter

updated information. Options 4 and 5 should select arrivals/departures and display them as appropriate,

based on airport codes submitted by the user. Option 6 should list all flights, regardless of airport or

scheduled times.

Edit: Must be made out of visual Studio 2010-2012

Regards

Vulpes · Answer

I only have time to write the class just now but here it is: using System; using System.IO; class Flight { private string _airline; private int _flightNumber; private string _originAirport; private string _destinationAirport; private int _departureTime; private int _arrivalTime; public string Airline { get{ return _airline; } set { if (value.Length 4) { Console.WriteLine(Airline code must be between 2 and 4 characters long); } else { _airline = value; } } } public int FlightNumber { get{ return _flightNumber; } set{ _flightNumber = value;} } public string OriginAirport { get{ return _originAirport; } set { if (value.Length != 3) { Console.WriteLine(Airport code must be 3 characters long); } else { _originAirport = value; } } } public string DestinationAirport { get{ return _destinationAirport; } set { if (value.Length != 3) { Console.WriteLine(Airport code must be 3 characters long); } else { _destinationAirport = value; } } } public int DepartureTime { get{ return _departureTime; } set { if (value 2359) { Console.WriteLine(Departure Time must be between 0 and 2359); } else { _departureTime = value; } } } public int ArrivalTime { get{ return _arrivalTime; } set { if (value 2359) { Console.WriteLine(Arrival Time must be between 0 and 2359); } else { _arrivalTime = value; } } } public Flight() { _airline = ; _flightNumber = 0; _originAirport = ; _destinationAirport = ; _departureTime = 0; _arrivalTime = 0; } public Flight(string airline int flightNumber string originAirport string destinationAirport int departureTime int arrivalTime) { _airline = airline; _flightNumber = flightNumber; _originAirport = originAirport; _destinationAirport = destinationAirport; _departureTime = departureTime; _arrivalTime = arrivalTime; } public void ReadData(Stream s) { using(StreamReader sr = new StreamReader(s)) { string line = sr.ReadLine(); string[] items = line.Split(' '); _airline = items[0]; _flightNumber = int.Parse(items[1]); _originAirport = items[2]; _destinationAirport = items[3]; _departureTime = int.Parse(items[4]); _arrivalTime = int.Parse(items[5]);; } } public void WriteData(Stream s) { using(StreamWriter sw = new StreamWriter(s)) { string[] items = { _airline _flightNumber.ToString() _originAirport _destinationAirport _departureTime.ToString() _arrivalTime.ToString() }; sw.WriteLine(String.Join(  items)); } } }

Vulpes · Answer

When you see the words 'menu driven' then that usually means that you should create a Console application and print the menu to the screen. You can then get the user's choice and take the appropriate action. If you put your Flight objects in a List rather than a Flight[] then you will be able to delete a Flight by simply removing it from the list. Adding new Flights and editing existing ones will also be easy enough. The other questions can be solved by iterating through the list selecting certain (or all) flights and printing out their details to the console. If you place the flight data in a space-separated text file then you can create a FileStream object from that file and then pass the resulting stream object to the methods which read or write data.

Vulpes · Answer

OK I'm moved the code on a bit more. As you said you didn't want to be bothered with Console.In etc I've got rid of that and am now using the usual Console.ReadLine() and WriteLine(). I've had to change the default constructor back to how we had it originally (i.e. it sets the fields directly) because we don't want the default values to be validated. I've just filled in the code for the first option - Add a flight - which leaves you with plenty more to work on :) using System; using System.Collections.Generic; using System.IO; class Flight { private string _airline; private int _flightNumber; private string _originAirport; private string _destinationAirport; private int _departureTime; private int _arrivalTime; public string Airline { get{ return _airline; } set { if (value.Length 4) { Console.WriteLine(Airline code must be between 2 and 4 characters long); } else { _airline = value; } } } public int FlightNumber { get{ return _flightNumber; } set{ _flightNumber = value;} } public string OriginAirport { get{ return _originAirport; } set { if (value.Length != 3) { Console.WriteLine(Airport code must be 3 characters long); } else { _originAirport = value; } } } public string DestinationAirport { get{ return _destinationAirport; } set { if (value.Length != 3) { Console.WriteLine(Airport code must be 3 characters long); } else { _destinationAirport = value; } } } public int DepartureTime { get{ return _departureTime; } set { if (value 2359) { Console.WriteLine(Departure Time must be between 0 and 2359); } else { _departureTime = value; } } } public int ArrivalTime { get{ return _arrivalTime; } set { if (value 2359) { Console.WriteLine(Arrival Time must be between 0 and 2359); } else { _arrivalTime = value; } } } public Flight() { _airline = ; _flightNumber = 0; _originAirport = ; _destinationAirport = ; _departureTime = 0; _arrivalTime = 0; } public Flight(string airline int flightNumber string originAirport string destinationAirport int departureTime int arrivalTime) { Airline = airline; FlightNumber = flightNumber; OriginAirport = originAirport; DestinationAirport = destinationAirport; DepartureTime = departureTime; ArrivalTime = arrivalTime; } public void ReadData() { Console.Write(Airline : ); Airline = Console.ReadLine(); Console.Write(Flight Number : ); FlightNumber = int.Parse(Console.ReadLine()); Console.Write(Origin Airport : ); OriginAirport = Console.ReadLine(); Console.Write(Destination Airport : ); DestinationAirport = Console.ReadLine(); Console.Write(Departure Time : ); DepartureTime = int.Parse(Console.ReadLine()); Console.Write(Arrival Time : ); ArrivalTime = int.Parse(Console.ReadLine()); } public void WriteData() { string[] items = { Airline =  + _airline F/N =  + _flightNumber.ToString() Origin =  + _originAirport Dest =  + _destinationAirport Departs =  + _departureTime.ToString() Arrives =  + _arrivalTime.ToString() }; Console.WriteLine(String.Join(  items)); } } class Program { static List flights; static void Main() { flights = new List (); while (true) { int option = GetMenuOption(); if (option == 7) return; ProcessOption(option); } } static int GetMenuOption() { Console.Clear(); Console.WriteLine( MENU); Console.WriteLine( ====); Console.WriteLine(
 1. Add a flight); Console.WriteLine(
 2. Delete a flight); Console.WriteLine(
 3. Edit a flight); Console.WriteLine(
 4. Show all arrivals for one airport); Console.WriteLine(
 5. Show all departures for one airport); Console.WriteLine(
 6. List all flights); Console.WriteLine(
 7. Quit

); int option = 0; do { Console.Write( Enter your choice 1 to 7 : ); int.TryParse(Console.ReadLine() out option); } while(option 7); return option; } static void ProcessOption(int option) { switch(option) { case 1: Console.Clear(); Flight f = new Flight(); f.ReadData(); flights.Add(f); break; case 2: break; case 3: break; case 4: break; case 5: break; case 6: break; } } }

SUNIL GUTTA · Answer

HUmm ty for your time again vuples i tried like this under text FileStream s1 = File.Open(c:\users\sunil\desktop\b.txt FileMode.OpenFileAccess.Write); writing and everything is fine now .... . . Now i am moving towards menu drive thing .. Any tips how to deal create a menu type look ? Then i guess i need to read the data from text file and use that options right /.??

Lakshmanan Sethu · Answer

What kind of help you want in this program? What is the kind of difficulty do you face here?

Vulpes · Answer

OK on the option 6 point you don't want to create any new objects here - you just want to iterate through all the existing objects in the List. It's easiest to use foreach and then just call WriteData() on each iteration. On the option 3 point you need some way of uniquely identifying a Flight object so it can be edited. So I agree that you should ask the user for the flight number first as that is presumably unique. You can then iterate through the list to see if you can find it - issue an error message if you can't. If you can find it then I'd display the record on the console using WriteData. You can then offer the user the chance to edit the fields by calling the ReadData method on the object you've found. The alterations made will automatically be reflected in the existing object (as this method sets its properties) and no changes will be needed to the List either.

SUNIL GUTTA · Answer

Hi vulpes Any logical advice is appreciated :) 3. Edit a flight ???? getting no idea .. say i can print the flight details based on flight number but how to edit ?? Thank you so so much

SUNIL GUTTA · Answer

vulpes :) Humm i been working on well Ty for such pretty menu :) yeah finished with option 6 :) just started working on the other options . Have i done in optimized way : case 2: Console.Clear(); for (int i = 0; i { Flight f2 = new Flight(flights[i].Airline flights[i].FlightNumber flights[i].OriginAirport flights[i].DestinationAirport flights[i].ArrivalTimeflights[i].DepartureTime); f2.WriteData(); } Console.WriteLine(Press any key to go to Menu ); Console.ReadKey(); break; Friend please dont give the code just please give me help where i needed so i can grow up and think better like you .. If you answer with code means to this question i can never learn to think better . so please patiently only when you are free comment here and guide me so i can do work myself ..

Vulpes · Answer

It's not showing an error because the constructors are setting the backing fields directly rather than going through the properties which is my bad. To remedy it just change the constructors to the following: public Flight() { Airline = ; FlightNumber = 0; OriginAirport = ; DestinationAirport = ; DepartureTime = 0; ArrivalTime = 0; } public Flight(string airline int flightNumber string originAirport string destinationAirport int departureTime int arrivalTime) { Airline = airline; FlightNumber = flightNumber; OriginAirport = originAirport; DestinationAirport = destinationAirport; DepartureTime = departureTime; ArrivalTime = arrivalTime; } As I think you're struggling a bit on the menu thing I'm going to write some code for that and will post as soon as I've done and tested it.

SUNIL GUTTA · Answer

I am going like this .. am i going in correct way ?? static void Main() { string airline =  ; string originAirport =  ; string destinationAirport =  ; int flightNumber = 0;int departureTime = 0; int arrivalTime = 0; Flight f = new Flight(); Console.WriteLine(Press M for menu list actions to perform); if(Console.ReadLine()==M) { Console.Write(Enter 3-DIGIT Airline:); airline = Console.ReadLine(); Console.Write(Enter Flight no:); flightNumber =Convert.ToInt32( Console.ReadLine()); } Flight f1 = new Flight(airline flightNumber originAirport destinationAirport departureTime arrivalTime); Console.WriteLine(Enter A-Add flight  +  +D=DELETE Flight); FileStream s = File.Open(c:\users\sunil\desktop\s.txt FileMode.Open); FileStream s1 = File.Open(c:\users\sunil\desktop\b.txt FileMode.OpenFileAccess.Write); f1.ReadData(s); f1.WriteData(s1); Console.ReadKey(); } Some issues ... Well in above one on console when it asked me airline name where we kept a setter with condition i given over 4 digits but its showing no error why ..

SUNIL GUTTA · Answer

Have you been taught anything about the console input output and error streams previously? Nope .. I will go with console.readline i am much familiar with that Anyways i will try and get back to you if incase any insights needed Cheers Have a nice day

Vulpes · Answer

Actually it's no great hassle to use Console.In for the input stream and Console.Out for the output stream so I've altered the ReadData and WriteData methods accordingly. public void ReadData() { TextReader cin = Console.In; TextWriter cout = Console.Out; cout.Write(Airline : ); Airline = cin.ReadLine(); cout.Write(Flight Number : ); FlightNumber = int.Parse(cin.ReadLine()); cout.Write(Origin Airport : ); OriginAirport = cin.ReadLine(); cout.Write(Destination Airport : ); DestinationAirport = cin.ReadLine(); cout.Write(Departure Time : ); DepartureTime = int.Parse(cin.ReadLine()); cout.Write(Arrival Time : ); ArrivalTime = int.Parse(cin.ReadLine()); } public void WriteData() { TextWriter cout = Console.Out; string[] items = { Airline =  + _airline F/N =  + _flightNumber.ToString() Origin =  + _originAirport Dest =  + _destinationAirport Departs =  + _departureTime.ToString() Arrives =  + _arrivalTime.ToString() }; cout.WriteLine(String.Join(  items)); } You can test these methods with this code in the Main() method: Flight f = new Flight(); f.ReadData(); Console.WriteLine(); f.WriteData();

Vulpes · Answer

I'd just clear the console print the options in the middle of it and then ask the user to select an option number validate it and take the appropriate action. If you put the code to generate the menu and get the user's choice in a separate method then you can call this method each time you're ready to process the next action. However I've just noticed that the question is asking you to get the data for the 'Add a flight' option from 'cin' rather than a file so the ReadData method will need to be changed to accommodate that. I'm not sure whether it means to use Console.In explicitly or to use the convenience method Console.ReadLine() like we usually do. Have you been taught anything about the console input output and error streams previously?

SUNIL GUTTA · Answer

Ty vulpes :) and Ty Lakshmanan Sethu for asking .. Actually i am done with the getters  setters in a class .. But i am confused i.e what is MENU DRIVEN ? DO I NEED TO CREATE A MENU OR do this in windows forms application ..1. Add a flight ... OK OK this can be done ..by using setting data right i.e setters property 2. Delete a flight ???????? how .. 3. Edit a flight ?? i gues this is similar to adding 4. Show all arrivals for one airport // ???????? 5. Show all departures for one airport // ?????? 6. List all flights // ????? 7. Quit Well small issue vulpes  i was unable to move on with the code given by u .. .. I JUST created a test class and working on with your code   TO read or writedata method what should i need to pass .. its asking IO strean to get passed .. i am trying to pass a file location /..tried many ways i am undone .. how to pass a stream to flight class My test class lass test { static void Main() { Flight f = new Flight(); Flight f1 = new Flight(); FileStream s = File.Open(c:\users\sunil\desktop\s.txt FileMode.Open); (workinf fineeeee) FileStream s1 = File.Open(c:\users\sunil\desktop\b.txt ?? ?? ?? ); (unable to write back .....) f1.ReadData(s); f.WriteData(s1); Console.ReadKey(); } } Regards