CIS 636 Spring 2006  Assignment 2 – Some Basic Calculations                                                      100 points

Assigned: 01/24/2006

Due: 01/31/2006 at the start of class 

You may work individually or in pairs for this assignment. But all work must be the work of the person/people whose name is on the code! If working in pairs, the individual contributions should be relatively equal. One possibility is to work together tonight, then finish separately (to avoid communication difficulties).

Main Assignment:

We are writing a program to help America East Airline keep track of their fuel expenses. Your program will interact with the user, asking for the number of miles to be flown on a flight, the price per gallon paid for the fuel, and the number of passengers on the flight.  Your program expected time in the air (in hours and seconds), the amount of fuel used, the cost for the fuel, the cost per passenger, and the passenger miles per gallon, and will display all basic information including the calculated information.

I would like your interaction with the user to be via dialog boxes, using static methods from RedmondMsgInBasic and RedmondMsgOut in my IO package. See the sample interaction below for a textual replay of what happened in one example.

Hand in:

• Disk with an entire folder containing the correct folder structure, your file, any other of my classes that you use, and the corresponding Byte-code files.  I should be able to get into the IDE and run your program without any messing with your files and folders. So test what you are handing in, even if you worked on the hard drive and tested that in the lab.
• Print out of your code. 

To avoid needless long waits, I recommend working on this on the c: drive or jump drive, then upon completion, copying it to the a: drive, testing it there, creating an extra backup for yourself.

Miscellaneous:

• Some simplifying assumptions need to be made. Assume the plane flies at a constant 600 miles per hour. Assume that fuel is used up at a constant 1.0 gallons per second flying.
• You can get any of my IO code you need from the assignment or review page of my WWW site. It is written with a package statement that assumes that it is in a package of named IO. Save it there.
• You shouldn’t have to change anything in RedmondMsgInBasic and RedmondMsgOut. The recommended methods make some simplifying assumptions, since we haven’t covered exception handling yet. This means that some exceptions will result if the user tries hard enough. Until we cover exceptions, we won’t catch invalid values that are the wrong type (e.g. letters where numbers are needed)). No biggie at this point.
• In using the read valid methods in RedmondMsgInBasic, you automatically get validation. The number of miles in the flight should be at least 50 and no more than 5000, the price per gallon should be positive and no more than $10.00, and the number of passengers should be at least 5 and no more than 600
• MAKE SURE YOUR PROGRAM WORKS! (i.e. more than just removing compile errors). Try more than the below example; convince yourself that it works. Be a skeptic. 
• The example below gives nice round results. With less round results, MANY digits after the decimal will be shown. OPTIONAL: use methods described on my www page http://www.lasalle.edu/~redmond/teach/636/formatting.htm to limit the number of decimal places.
• Put YOUR NAME, and e-mail address and date in comments at the beginning of the program.
• Also, comment any significant code to document it. 
• Indent code following standard conventions (indent to show that something is “inside” or “part of” the preceding code (e.g. inside if’s or loops, or statements continued on a new line. This will not have much impact on this small program).  The IDE should handle this if you hit ENTER and move on to the next line (If you make changes, you may need to TAB to make things right).
• Name your variables meaningfully, to describe their use in the program.

Textual Version of Interaction:

This program will analyze the fuel costs for a flight, giving the cost per passenger and passenger miles per gallon

How many miles in the flight (whole number)?

3000

What is the price of jet fuel (mpg)?

2.5

How many passengers are traveling?

300

Results

   Miles:              3000

   MPH:                600

   Hours:              5.0

   Seconds:            18000.0

   Gals/Sec:           1.0

   Fuel Used:          18000.0

   Fuel Price:         2.5

   Fuel Cost:          45000.0

   Passengers:         300

   Cost Per Passenger: 150.0

   Passenger Miles Per Gallon: 50.0