World Traveler

Background

Mrs. Evans, Ms. Block and three other faculty members from the CSEE department attended the SIGIR conference that was held in Tampere, Finland a few years ago. On the way, we stopped in London for one night and in Stockholm for the weekend. The conference was from Monday - Thursday in Tampere. After the conference, we took a bus tour to St. Petersburg, Russia. After the Russian tour, we spent the night in Helsinki, then another night in London before returning home. Our trip caused us to visit 5 cities in 4 different countries. Each of these countries was in a different time zone and each used a different currency. All of Europe uses the Celsius scale for temperatures. It just seemed as if we were always doing conversions.

The Task

Your "World Traveler" program will allow the user to perform conversions from these four currencies into US dollars, calculate the time of day (Eastern Standard Time) from the time in each of the 5 cities visited, and also convert celsius temperatures into fahrenheit temperatures. Your program must be menu driven and will involve two different menus, the main menu that uses integer choices and a menu of locations that uses character choices. You will find the following information useful :

• TIME:
  • London time is 5 hours ahead of Eastern Time
  • Stockholm time is 6 hours ahead of Eastern Time
  • Tampere and Helsinki time is 7 hours ahead of Eastern Time
  • St. Petersburg time is 8 hours ahead of Eastern Time
• CURRENCY:
  • There are 1.53730 dollars per British pound
  • There are 0.139083 dollars per Swedish kronor
  • There are 1.34960 dollars per Euro
  • There are 0.0343348 dollars per Russian Ruble
• TEMPERATURE:
  • If you are unsure about how to convert Celsius temperatures to Fahrenheit temperatures, the formula was shown in Lab 2 - the emacs lab.

You MUST write this homework using the design explained in lecture on 4/12 and 4/13 without modification. See the design diagram for clarification.

You MUST use constants for each of the conversion factors shown above, both time and currency. You must also use constants for the main menu choices and the values used must match those shown in the sample output (1 is for time, 2 for currency, 3 for temperature and 4 quits.) Include constants for any other items where they would be appropriate, so that you have no "magic numbers" appearing in your code.

The letter choices for the locations menu must also match the cities as shown in the sample output, (L,S,T,H,P & M) and should allow both upper and lower-case versions of those letters and should continually re-prompt when invalid letters are entered.

Your program MUST include the following functions. Do NOT change the function headers shown below:

• def printGreeting(): - displays a suitable greeting to the user
• def displayMainMenu(): - displays the main menu choices
• def displayLocationsMenu(): - displays the location menu choices
• def convertTime(): - a high level function that handles all of the user input, processing, and output dealing with converting time.
• def convertCurrency(): - a high level function that handles all of the user input, processing, and output dealing with converting currency.
• def convertTemp(): - a high level function that handles all of the user input, processing, and output dealing with converting temperature.
• def foreignTimeToEastern (hour, adjustment): - changes the hour (in 24-hour format) passed in by the amount of the adjustment yeilding Eastern Standard Time in 12-hour form with the appropriate AM or PM abbreviation
• def foreignToDollars(units, conv): - accepts the number of units of a foreign currency and a conversion factor and returns the equivalent number of US dollars.
• celsiusToFahrenheit(celsius): - returns the fahrenheit equivalent of the celsius temperature passed in.
• getValidTime(): - returns a time between 00:00 and 23:59, inclusive, as an hour, minute tuple.
• getValidInt(question, min, max): - prompts the user and gets an integer from the user between min and max, inclusive and returns that valid integer.
• getPositiveReal(question): - prompts the user and returns a positive float.

The Design Diagram

Sample Output

linuxserver1.cs.umbc.edu[101] python hw8.py

Your greeting goes here

What would you like to convert ?

        1 - Time
        2 - Currency
        3 - Temperature
        4 - QUIT

Your choice (1 - 4): 1

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : L

What time is it ?

Enter the hour (0 - 23): 22
Enter the minute (0 - 59): 15

22:15 in London is  5:15 PM EST

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : s

What time is it ?

Enter the hour (0 - 23): 10
Enter the minute (0 - 59): 45

10:45 in Stockholm is  4:45 AM EST

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : p

What time is it ?

Enter the hour (0 - 23): 24
Enter the hour (0 - 23): 25
Enter the hour (0 - 23): 18
Enter the minute (0 - 59): 60
Enter the minute (0 - 59): 30

18:30 in St. Petersburg is 10:30 AM EST

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : m

What would you like to convert ?

        1 - Time
        2 - Currency
        3 - Temperature
        4 - QUIT

Your choice (1 - 4): 2

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : l
How many pounds ?  20

20.00 pounds is $ 30.75

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : s
How many kronor ?  500

500.00 kronor is $ 69.54

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : t
How many euros ?  45

45.00 euros is $ 60.73

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : p
How many rubles ?  1000

1000.00 rubles is $ 34.33

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : q
q isn't a valid choice.  Try again.

Choose a location or M to return to Main Menu

        L  - London
        S  - Stockholm
        T  - Tampere
        H  - Helsinki
        P  - St. Petersburg
        M  - Return to Main Menu

Enter location or M to return to Main Menu : m

What would you like to convert ?

        1 - Time
        2 - Currency
        3 - Temperature
        4 - QUIT

Your choice (1 - 4): 5
Your choice (1 - 4): 0
Your choice (1 - 4): 3
What is the Celsius temperature ? 27
27 degrees C is 80.6 degrees F


What would you like to convert ?

        1 - Time
        2 - Currency
        3 - Temperature
        4 - QUIT

Your choice (1 - 4): 4
linuxserver1.cs.umbc.edu[102] 

Input Guarantees

• When the graders test your homework, they will use only integer input for the Main Menu
• When the graders test the Locations Menu, they will use only alphabetic input.
• When the graders test the getPositiveReal() function they will use only numeric input.

Submitting Your Work

After you've finished your assignment, use the submit command to turn it in.

• You must be logged into your account.
• You must be in the same directory as the file you're trying to submit.
• At the Linux prompt, type

  submit cs201 HW8 hw8.py

Don't forget to watch for the confirmation that submit worked correctly. Specifically, the confirmation will say:

Submitting hw8.py...OK

If not, try again.

You can check your submission by entering
submitls cs201 HW8
You should see the name of the file that you just submitted, in this case, hw8.py.