CS 230 Spring 2007

Assignment 3 –Simple IFs

100 points

Assigned: 02/07/2007

Due: 02/14/2007 at the start of class

Pre-Lab (Do Before Lab):  Bring materials – a way to save a copy for you and a copy to turn in. Plan out tasks, objects, and events needed for program. If this program won’t be EASY for you, write pseudocode for the main button.

Main Assignment:

A parking garage charges a $8.00 minimum fee to park for up to 4 hours. The garage charges an additional $1.50 per hour or each part thereof in excess of 4 hours. The maximum basic charge is $15.00. On top of this (in addition to this), large vehicles (vans, SUVs) are charged an extra $3.00 (thus a van that parked long enough could be charged as much as $18.00). Write a program that gets from the user the number of minutes spent in the garage, and whether the vehicle is a large vehicle (Checkbox recommended), and reports the parking fee. Your program should include a “Check Out” button that will calculate and display the total charge.  In addition to the calculate capability, provide capabilities to clear all of the controls (text boxes and checkbox) to start again, and to exit.

Hand in:

• Floppy disk  or CD-R with an entire folder containing all files related to the project. Please set the name of the project to something other than the default name (WindowsApplication1, …). It is helpful if you use a name that identifies you as well as the assignment (e.g. yourlastname assignment 3). Use Windows to copy the whole folder, instead of trying to “Save As”.
• Print out of your code. Avoid printing the code generated from the visual creation of the form.

Task Details:

• Hint: In figuring out how many hours to charge for when somebody has not stayed an even number of hours,

·      Some built-in VB methods that could be useful include Convert.toInt32 and Math.Ceiling (which finds the largest number greater than or equal to a given number (Math.Ceiling of 5.4 would be 6). (it returns a double, so a convert to integer may also be needed).

• Hint: If you use the above method there are 3 possible cases to handle (what are they?)
• Hint: If you branch based on the number of minutes stayed into all possible fees, how many cases are there to handle?
• Make sure you handle partial hours – if the person stays 241 minutes, they pay for 5 hours.
• Define numbers (especially those that could change sometime in the futures) as named constants.  E.g. the minimum fee, the basic cost, the number of hours you get for that basic cost, … all should be declared as constants to make it easy to implement “revenue enhancements.”
• Note that we have now covered specifying how many decimal places to display – display the charge as currency.
• We’re going to assume that the clerk enters valid and reasonable values for now, so that we’re not taking on too many new tasks at once (Unless this is EASY for you – don’t mess yourself up by doing extra before you get the required done)
• MAKE SURE YOUR PROGRAM WORKS! (i.e. gets the correct answers).  It doesn’t have to just run, it needs to run correctly!  It should run on any inputs (We are now branching – so the program must be tested on more inputs to ensure that all paths through the program code work!). One example to get you started: 250 minutes for an SUV should cost $12.50.

Miscellaneous

• You must turn on Option Explicit and Option Strict.
• Put YOUR NAME, e-mail address, date, and purpose of the program in comments at the beginning of the program. The purpose should be what the program is supposed to do, not the learning goals. Comments are indicated with a single quote (everything after the single quote is only for humans)
• You MUST include comments that explain your program in order to get full credit.
• Remember to use meaningful variable names, and indent to show the structure of the program (VB usually does this correctly).
• Name all textboxes and buttons meaningfully, and use conventions for starting their names.
• Make textboxes that user should never enter a value in (results / outputs) “Read Only”
• Put your name on the form as a Label or as part of the form title.
• Try to use good user interface design. Make clear what user needs to do and what the answers mean.