CS 230 Fall 2006                                                                Assignment 4 –More Complicated Branching                              100 points

Assigned: 09/27/2006

Due: 10/04/2006 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. Plan out major pseudocode. This program has complicated logic – think about it BEFORE lab!!!

Main Assignment:

Write a program that calculates the amount of tax that a taxpayer should have paid. Get from the user for their net income (this is income after all deductions and exemptions etc – we’ll save that stuff for a more advanced program) and the amount of tax they have already had withheld from their paycheck. Then according to the simplified (for your benefit) tax schedule shown below, calculate the amount of tax, and the amount of refund or the amount of tax still due. 

Tax Schedule (We are only handling Single taxpayers):

Income	Tax Rate
First $20,000 in net income	12%
Next $30,000 in net income	25%
Remaining Income	35%

Provide capabilities to calculate, clear the text boxes to start again, and to exit.

Hand in:

• Floppy disk 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, …). Use Windows to copy the whole folder, instead of trying to “Save As”.
• Print out of your code.

Miscellaneous:

• You must turn on Option Explicit and Option Strict.
• If you have any questions about the tax scheme, please ask!!! Read carefully! Your calculations need to meet the requirements of the task.
• Define income thresholds and tax rates as named constants, so that if the tax law changes they are easy to change.
• Note that we have now covered specifying how many decimal places to display – display a number appropriate for the results, with currency symbols where appropriate.
• Make outputs “Read Only” so the user cannot change the calculated results.
• We’re no longer going to assume that the clerk enters valid and reasonable values, so ensure that values entered are numbers and that they are in acceptable range. Let’s assume that income and amount withheld SHOULD NOT be negative, and that income should not be more than $1 billion and amount withheld should not be more than $100 million
• MAKE SURE YOUR PROGRAM WORKS! (i.e. gets the correct answers). Now that our program is branching, we need to try more examples to make sure they work. Think, “what different possibilities need to be checked?” For each, calculate the correct answer by hand and see if your program gets it!
• Put YOUR NAME, and e-mail address and purpose of the program in comments at the beginning of the program.
• Put your name on the form as a Label or as part of the form title.
• 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).
• Try to use good user interface design.