(Latest Revision: 10/05/2007)
SECOND CS 1500 SOLO PROGRAM: Estimating
Federal Income Tax
Your assignment is to write a program that estimates 2007 federal income tax
for single filing status.
INPUT AND OUTPUT:
The program must prompt for the taxable income. The user will input a
non-negative integer taxable income.
The program must compute the estimated tax on the taxable income, using
Schedule X on this web page.
(There is a PDF reproduction
here
and a cached html version
here.)
The program must then report the tax, as an integer.
Have a look at
the sample script
to see how it should look when you run the program. Make sure to write the
program so that it inputs only the taxable income. If I decide I want
to test all the programs I will want to use redirection from prepared files of
input. This requires that you and I have a precise agreement on the form of
the input.
TESTING AND CORRECTNESS:
Your program must conform to the rules below. We will discuss and clarify
the meaning of these rules in class.
- The test script must show testing of a representative sample of
ordinary data. It must also show coverage on and near at least two
boundary data values.
- If I run your program and it gives an incorrect result, then you may
lose a very substantial amount of the credit for this assignment. (How
tolerant would you be of a tax program that gives wrong answers?)
DESIGN DETAILS:
You should use int variables in this program for the income and the
tax.
Since the program will report dollars but not cents, it is permissable if the
reported value of the tax is incorrect by up to one dollar more or less than
the true amount.
When you compile code like this
int tax ;
if (income <= 31850) tax = 782.50 + 0.150 * (income - 7825) ;
you may see a warning from the compiler like this:
warning: converting to 'int' from 'double'
because the code assigns a real number (double) to the integer variable
tax.
Nevertheless the code above is OK. It just computes the real number
corresponding to the expression, and then the decimal part is "thrown away"
when the value is assigned to the variable. The value that tax
gets is incorrect by no more than $0.99.
A compiler warning is not the same thing as a syntax error. It does not
prevent the compiler from producing an executable version (translation) of
your program.
WHAT TO TURN IN:
You will be sending me two e-mail messages. Please follow these rules:
- Always send me e-mail as plain text in the main message body.
Never send me attachments.
- Always use the exact subject line I specify for each
message. (I often get hundreds of e-mail messages in a week. The
subject line allows me to find and sort messages.) You will lose a
significant number of points on the assignment if you use the wrong
subject line.
- Be very careful when you send the e-mail. You may use the
instructions in your
Hello World! lab excercise
for guidance. Of course, you will need to make the obvious changes to
those directions -- you have to use the correct subject line and
filename.
- Always send yourself a copy of each e-mail message you send to me,
check immediately to see if you receive the message intact, and
check within a few minutes to see if you have received e-mail notifiying
you about an undeliverable message. You are
responsible for sending e-mail correctly.
Here is the list of things that you have to turn in:
- At the start of class on the
due date
place the following item on the "counter" in front of me:
- a hardcopy (printed listing) of your program (the C++ source code).
Make sure all the code is properly formatted and that it all shows
on the paper. (You can't put more than about 75 characters on any
line - including blanks.)
- Before midnight on the due date
send me the following by e-mail:
- A copy of the source code (C++ code) with subject line:
CS1500Solo2Source
and
- your (filtered) script, with subject line
CS1500Solo2Script
Note that there are no spaces in the subject lines given. It is important
that you do not insert any spaces. My e-mail address is:
john@ishi.csustan.edu
WHEN IS THIS ASSIGNMENT DUE?
Look for the due date in
the class schedule.
(It's at the top level of the class directory.)