IT350 - Web and
Lab 06 - The Smart Money
You’ve been offered a “starter loan” of $20,000.
This is a fantastic opportunity, but what are you going to do with that money?
This week's lab will help you explore three options: investing, casino games,
You must create a folder on your web drive called
"Lab06" (without the quotes) and store your work in that directory.
This lab does NOT draw on the
previous labs, so there is no need to copy your old web pages into this
This week you will make a single new
web page, money.html, such that:
- Your page has a prelude
declaring it as an XHTML document, and it roughly follows XHTML rules. Validation is encouraged but not
- Your page is reasonably appealing
to look at (e.g. using styles, colors, etc). Your page should be tasteful
and easy to read.
- When finished, you will have
a page that looks something like this when it is first loaded:
You do not have to make it look exactly like this (colors etc.) but
the general layout should be similar.
- The page will have a single
button that, when clicked, performs all of the calculations described
below. It is strongly recommended
that you first make the HTML for the left column only, and get the
later handles the “craps” and “lottery” columns. When complete, here is one sample
output after clicking the “Calculate Results” button:
- The leftmost column shows
what would happen if you invest your money. The user will provide the
annual interest rate earned on the money (initially $20,000) in an input
field. You will have four additional input fields below the interest rate
which, when the calculate button is hit, will be populated with the value
of your investment after 10, 20, 30, and 40 years, respectively. The
formula for computing the value of your investment over time is:
Value = Principal * e(rate * time)
(Hint: There are some handy functions
in the Math object that will help you – see textbook section 12.3)
Your page should generate an error if the user specifies an
interest rate less than or equal to 0 or greater than 0.2 (20%). Additionally,
your page should not perform any calculations (e.g., do nothing for the investing,
craps, or lottery columns) until the user enters a legal value.
- The middle column represents
what would happen if you played craps with your money. The user will
provide the amount bet on each hand in an input field. You will have four
additional input fields below the bet amount which, when the calculate
button is hit, will be populated with the amount of money you have after
10, 100, 500, and 1,000 games. Labels these fields appropriately! If at
any time the amount of money you have becomes zero (or less!), it should
remain zero for the rest of the games (i.e. it's impossible to go into
Do not simulate the whole craps game here (but see the extra
credit). The odds of winning each individual craps game is 49.3%. If the
player wins, their cash increases by the bet amount. If they lose, the bet
amount is subtracted from their cash.
Your page should generate an error if the user specifies a bet less than
or equal to $0 or greater than $20,000. Additionally, your page should
not perform any calculations until the user enters a legal bet value.
- You will have a section
representing what would happen if you played the lottery with your money.
There is no user input for this section. You will have four input fields
which, when the calculate button is hit, will be populated with the amount
of money you have after purchasing 500 tickets, 1,000 tickets, 10,000
tickets, and 20,000 tickets respectively. Labels these fields
appropriately! Each ticket cost $1. To win the lottery, you must choose
six numbers out of 54 correctly, thus making the odds of winning: 1 / (54
* 53 * 52 * 51 * 50 * 49), or 1/18,595,558,800. The lottery prize is $35
- You should have separate
functions for the lottery, craps, and investment computations. Writing
other functions may save you some work too!
You do NOT want to create all of the HTML for
HTML in the <body> section. Then
The example in section 10.6 is very helpful for
a button. Note though that this example
is simulating individual craps games, which is different from what you are
Using Mozilla Firefox is highly recommended for testing. However, your final result should run on Firefox and IE.
You should not use document.writeln()
inside your functions that are called by ‘onclick’.
Doing so erases your whole page and
starts over with just the new content that you just output. Instead if you need to output something to the
user (or to debug) either use window.alert() or change
the value of some input box.
Your web page must be constructed using Notepad or a similar
text-only editor. The use of programs such as Microsoft Word, Microsoft Frontpage, DreamWeaver, ColdFusion, Mozilla Composer,.
etc. will be considered an honor offense.
For a nominal amount of extra credit do some/all of the following:
Make a new table that shows dynamically how your
money changes over time. For instance,
have three boxes showing the amount of money you have under each of three
scenarios and update these periodically (perhaps twice a second) to show how
much money you have left after a certain amount of time. To do this you will have to make some
assumption about how many craps game / lottery tickets you do per year.
Write a simulator for some casino game. Not craps, because the book does that, but
perhaps for poker or blackjack. Show the
cards that were played in some appropriate way. Have a button that causes one
game to be played, or else have different buttons that lets the user choose how
to play (e.g., hit or stand? what to
bet? double down?). Update your total
money appropriately when a game/hand is over.
- Your page should contain all
of the elements described in the requirements section above.
- All of your files should be
in a folder called "Lab06" (without the quotes) on your web
drive. Your instructor will assume that your web page is viewable at http://www.mXXXXXX.it.cs.usna.edu/Lab06/money.html
where XXXXXX is your alpha number. You may want to check that this URL is
viewable and that everything works correctly from a computer where
somebody else is logged in. If you've goofed and linked to a file on
your X drive, this will help you catch it!
- Turn in the following
hardcopy at the beginning of class on the due date, stapled together in
the following order (coversheet on top):
- A completed assignment
coversheet. Your comments will help us improve the
- A printout of the source to your Lab06/money.html
- If you use any
external script files, include a printout of those too.