Re: [Dev-C++] student needs a little help
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Re: [Dev-C++] student needs a little help
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From: Kevin W. <ke...@me...> - 2002-02-19 22:05:32
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Hi everyone,
It always pays to read the question carefully when you get an assignment
problem like this one.
Some key points are:
You can assume that there will only be up to 50 items in the inventory.
The question says to use a data structure for the items and define and
implement a set of operations to encapsulate it (sounds like a class? ).
Using a list (with a binary or linear search) is suggested - but it is
only a suggestion.
A lot of the work ( and therefore a lot of the marks) is concerned with
trapping errors and dealing with exceptions.
Personally, I would create an instance of a class for each item as it is
read from the dat file, and store a pointer to it in an array. For 50 items,
it doesn't seem worth the effort of using a binary tree. I like assignments
like these as there is plenty of scope to be creative!
Kev.
----- Original Message -----
From: Marton Rusk <mar...@ho...>
To: <dev...@li...>
Sent: Friday, February 15, 2002 10:23 PM
Subject: [Dev-C++] student needs a little help
> Hello Everyone,
>
> I'm currently a CS Student and need a little help. I have been given the
enclosed programming assignment but I'm not sure how to do it. It seems like
a simple problem to solve but I don't know how to do list let and from the
looks of the problem it will need one. I guess the teacher things we are
supposed to know how to do list already.
>
> Anyhow, I'd like a few pointers on how to do this problem if possible.
Maybe how to do the part of the code where it would require a list and
search.
>
> Any help is appreciated, thanks.
>
> Marton
>
>
> Program #2: Grocery Store Checkout (60 points)
>
>
>
> Your assignment is to write, run, and test a C++ program, pg2, to simulate
the operation of a
>
> grocery store checkout system. Your program should first build a data
structure to contain
>
> information on all the products available in the store. Then the program
should print the cash
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> register receipt for each customer.
>
>
>
> INPUT
>
> The input for pg2 has two sources: the inventory information is input from
a text file,
>
> and the customer transactions are input from the keyboard.
>
>
>
> 1. The information about each product carried by the store is listed on a
single line in the
>
> inventory file "invent.dat", in the following format:
>
> <product number> <description> <price> <tax>
>
> where <product number> is a five-digit positive (nonzero) integer,
<description> is a string of
>
> at most 12 characters with no embedded blanks, <price> is a real
number, and <tax> is a
>
> character ('T' if the product is taxable; 'N' if it is not taxable).
The data in the inventory file is
>
> ordered from smallest to largest product number.
>
>
>
> 2. The customer transactions are input from the keyboard, in the following
format:
>
> <product number> <times>
>
> where <product number> is as described above, and <times> is an
integer in the range 1 to 100,
>
> indicating the quantity of this product desired. A zero input for
<product number> indicates the
>
> end of the customer's order. (The store will soon be using a scanner
to input the product number,
>
> but for now it is typed in by the cashier.)
>
>
>
> OUTPUT
>
>
>
> The program outputs should be written to a text file called
"receipts.out", which can be printed
>
> out for purposes of determining your grade.
>
>
>
> 1. The inventory information of invent.dat is echo printed to the output
file.
>
>
>
> 2. The cash register receipt for each customer is written to the output
file. The receipts should be
>
> nicely formatted, with the product description (not the product
number), number of items, item
>
> price, and total price for each product printed on a single line. At
the end of each customer's
>
> order, the subtotal for all items, amount of tax on taxable items, and
total bill should be printed,
>
> clearly labeled. (The tax rate is 7.5% for taxable items.)
>
>
>
> PROCESSING
>
>
>
> pg2 first reads in all of the inventory information from file invent.dat,
echo printing the
>
> information to the output file receipts.out. The program then prompts the
cashier to begin inputting
>
> the order for the first customer. This customer's order is processed, and
the receipt is printed to the
>
> output file.
>
> After each customer's order is processed, the program should ask the
cashier if another customer is
>
> to be processed. If the answer is 'Y', the program sets up to process the
next customer; if the answer
>
> is 'N', the program terminates with a friendly message.
>
>
>
> ERROR CHECKING
>
>
>
> The following input errors are possible and should be handled by pg2
>
>
>
> 1. Duplicate <product number> in inventory file. Write an error message to
the output file and skip
>
> the second entry.
>
> 2. <Product number> not in inventory file. Write an error message on the
receipt, ignore that product
>
> number, and continue with the next item.
>
> 3. <Times> not in the specified range. Write an error message to the
output file, ignore that line, and
>
> continue with the next item.
>
>
>
> EXAMPLE
>
>
>
> . From File "Invent.in":
>
> 11012 gallon-milk 1.99 N
>
> 11014 butter 2.59 N
>
> 11110 pie-shells 0.99 N
>
> 20115 laundry-soap 3.60 T
>
> 30005 homestyle-br 0.99 N
>
> . From keyboard (one customer):
>
> 11110 2
>
> 40012 3
>
> 20115 1
>
> 0
>
>
>
> . To "Receipts.out" file:
>
> ---------------------------------------------------------
>
> SEP 10, 1998 6:00 pm (* date and time optional *)
>
> Customer 1
>
> pie-shells 2 @ 0.99 1.98
>
> *** item 40012 not in inventory ***
>
> laundry-soap 1 @ 3.60 3.60 TX
>
> Subtotal 5.58
>
> Tax 0.27
>
>
>
> Total 5.85
>
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> DATA STRUCTURE
>
>
>
> The inventory information can be stored in a list of product records.
Assume that the maximum
>
> number of products is 50, for purposes of writing this program. As the
data in the inventory file
>
> is ordered from smallest to largest product number, it is very simple to
insert the product records
>
> into this data structure in order. You can use either a sequential or
binary search to locate a product
>
> number in the inventory.
>
> You should specify this data structure as an ADT, as described in the
chapter; define and implement
>
> a set of operations to encapsulate it.
>
>
>
>
>
> TEST PLAN
>
>
>
> Be sure to include test cases to test your error conditions in your test
plan.
>
>
>
> DELIVERABLES
>
>
>
> 1. A disk of the source code of the program pg2 and all included files.
>
> 2. Hard copy of a listing of your implemented test plan.
>
> 3. Hard copy of the output file, "receipts.out", produced by running your
program using the input
>
> specified in your test plan.
>
>
>
>
>
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