The program outputs should be written to a text file called “Receipts.out”.
1. The inventory information 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
The program first reads in all of the inventory information from file “Invent.in”, echo printing the information to the output file. 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 an exception class:
1. Duplicate in inventory file. Write an error message to the output file and skip the second entry.
2. not in inventory file. Write an error message on the receipt, ignore that product number, and continue with the next item.
3. 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
madmik3, thanks for the help. We can use vectors..or basically anything…I tend to have trouble starting the projects but once I get in my head what I am doing I am fine. I think its just because I haven’t had to write enough programs using the things I have learned. I learned a lot of the input from files but never had to write a program using it. I have used output quite a bit though. The problem doesn’t seem that bad..once I understand how to get input to read the file and store the information, once its stored I need to figure out how to get the program to look at the stored information and get it to output in the right order.

I can code everything else fine, and this shouldn’t be that bad either, ill take a look at vectors and see if that will help me.

Best answer:

Your questions are somewhat hard to answer and this is obviously a homework problem. So I won’t give everything away.

First off, working with files from c++ will be a bit tricky for the new programmer. I would first write a few small test programs to ensure that you understand basic file io. IO in c++ is operating system independent. So it’s hard to tell you exactly what to look for because I don’t know what operating system you are working with. But in general it seems that fopen and fscanf and fprintf are the functions I would use to solve the problems listed here. There are numerous sources that show you how to use them.

Secondly, programmers test to “see there functions” differently. To answer the question what functions do you need ask yourself what would I do if I was doing this without a computer. Perhaps you would examine the input, then calculate the output and then report the output. so your functions would be Examine, Calculate, and Report.

Data structures are complicated and it’s hard to tell you what to do because I don’t know what you can use. But I would use a vector from the standard template library. This might be considered cheating for a homework project.

Lastly, break your problem down into small chucks. Solve each of them and them composite the result. Don’t try and do everything at once. Create and test each part independently. Think of it as 5 small projects and not one big one.

good luck and remember this should be kind of fun, if it’s not maybe programming is not for you as it will be a lot more of the same :)

Tags: Data, HELP, structures

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