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The ABC Hardware Company has hired you to program its Accounts Receivable department. (A/R are accounts that owe money to the company for purchases from the company)

There are two types of input data

1. A master file in ascending order by customer number, containing a 4-digit customer number, a 20-character customer name and a balance due.

2. A transaction file containing records of each transaction by each customer. This file is in ascending order by customer number. There should be more than one transaction record per master record. Each related group of data in a file is called a record. A record should be stored in a structure.

Each record starts with a character, O for order or P for payment. Each also contains the four-digit customer number, a four-digit transaction number, plus up to three more values:

If the code is O, the record contains the item ordered (20 characters), the quantity ordered (an integer) plus the cost of the item. (You must multiply to get the total cost).

If the code is P, the record contains the amount of the payment.

You are to read in records one at a time from the two files and use the transaction file records to update the master file. Process all transaction records for each master record before going on to the next master record. If the transaction record contains an O in column 1 calculate the order amount and add it to the balance due. If the record contains a P in Column 1 subtract the payment from the balance due. Keep a running total of the A/R Balance of ABC Company (that is the sum of the balances due for each customer).

Your program should

Check for errors such as duplicate master records or records in the transaction file with a customer number that does not appear in the master file.

After processing a master record and all its transaction records prepare an invoice for each customer which lists on top the customer name and number, a line depicting the previous balance (the original balance in the master record before any transactions) followed by the transactions and the a balance due.

It should look like this

Customer Name Customer Number

Previous Balance $xxxxxxxxxx.xx

transaction number item ordered order amount

transaction number item ordered order amount

transaction number payment payment amount

transaction number item ordered order amount

Balance Due $xxxxxxxxx.xx

Dont forget payments reduce balances orders increase balances. You are to create your own data using at least 7 to 10 customers with an average of 4 to 5 transactions each.

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