Create A Cash Register Program Called Assn4 You Will Write

Create a cash register program called assn4 . You will write a cash register, assn4 will initialise the register, accept purchases, make change, and provide a report on the total of goods sold at the end of the day, the total of cash in the register, and the number of each type of bill. Provide a bash script of test cases, of transactions, checking expected output. The Assignment Write a commandline utility called assn4 which will process operations init, purchase, change, and report. Your program will store the drawer's state in a local file, format of your choosing. The cash register only works with $1's, $5's, $10's, $20's. Change should always be made with the largest available denominations, and your program should handle the problems with running out of various denomination. The major consideration with this assignment is to develop the unit tests to prove your software is robust and correct. Especially around the edge cases where the till is out of specific denominations. Make sure the change command returns the correct total. Don't return three tens in exchange for a twenty. Return Codes 0 SUCCESS (drawer was successfully changed) 1 Bad arguments (format/number) 2 Amounts don't jibe. E.g., left and righthand side of change aren't equal, or amount tendered is less than purchase price 3 Drawer has insufficient money or denominations to make proper change 4 Unable to read/write data file Note: For any nonzero (unsuccessful) return value, the state of the register will remain unchanged. Descriptions of Subcommands init, purchase, change, and report: Initialize drawer, using counts of bills provided. If a drawer already exists, this will overwrite it. (Essentially, start a new shift.) Output: None Purchase: Defines a transaction with a specified amount; bills provided to the register. Output will be a single line if successful: change returned, with format: ones fives tens twenties. Change: Provides change based on bills requested or purchased, ensuring it's made from the largest denominations. Report: Outputs total amount in drawer and breakdown of bills, and total sales. All amounts are USD. Follow the specs for output formatting. If no argument is supplied, print a usage message and exit. Program should be defensive against incorrect input. Example workflows and output are provided, illustrating initialization, purchase, change, and report commands. You may implement this in any language hosted on the tux machines. If Java, provide a shell script to invoke your compiled program. The key point is to develop thorough unit tests to verify correctness and robustness, especially for edge cases such as insufficient denominations. Submit: a makefile with targets build, clean, view; a test script (test.script); your source code files; optional README. Use filenames as specified. Ensure the program state remains consistent following failed operations. The focus is on correct change-making, handling insufficient funds, and persisting state across commands.

Paper For Above instruction

The implementation of a cash register system, as specified in the assignment, involves designing a command-line utility named assn4 that manages a cash drawer with bills of denominations $1, $5, $10, and $20. The system must support four primary operations: initialize the drawer with specific bill counts, process purchases, provide change, and generate reports on the drawer's status and sales totals. The core challenge lies in ensuring correctness and robustness, especially in making change with limited denominations and handling edge cases such as insufficient bills or invalid input.

Design Considerations:

The system should persist the drawer state in a local file, formatted as per developer choice, to preserve data across multiple command invocations. Each operation is modeled as a subcommand, with careful validation of input arguments and execution conditions. The program must return specific status codes indicating success or various failure modes, and must leave the drawer state unchanged upon operation failure.

Implementation Details:

- Initialization (init): Sets the bill counts in the drawer to user-specified amounts. Overwrites the existing state if any.

- Purchase: Records a purchase transaction by deducting the purchase amount from the drawer, accepting bills in a specified count. After accepting payment, it calculates and returns the change, ensuring the change is given using the largest bills available. If change cannot be properly made or funds are insufficient, no state change occurs, and an appropriate error code is returned.

- Change: Calculates the change to return to the customer based on bills provided or the purchase, again with best-fit change-making while handling insufficient bills.

- Report: Outputs the total amount in the drawer, the breakdown of each bill type, and total sales for the day.

Edge Cases:

- Out-of-stock denominations during change-making

- Invalid or malformed input arguments

- Insufficient funds or bills for a purchase or change

- File read/write failures

- Ensuring change is always made with the largest denominations, e.g., not giving three $10 bills for a $20 bill

Robustness and Testing:

This assignment emphasizes the development of comprehensive unit tests. Tests should simulate real-world scenarios, including edge cases such as attempting to make change when the drawer is short on certain denominations, or handling invalid input independently of successful transactions. The test script must exercise each subcommand with various inputs, verifying correctness by comparing expected and actual outputs, and ensuring the internal state remains consistent after failed operations.

Implementation Languages and Submission:

While compliance with any modern language is permitted, the program must be compatible with hosted environments ('tux machines'). For Java implementations, provide an accompanying shell script to invoke the Java program appropriately. The submission should include a makefile with targets for building, cleaning, viewing source code, along with the test script, source code files, and optional documentation. It is critical to adhere to specified file naming conventions and to ensure that command-line invocations follow the intended syntax, and that all state changes are correctly persisted and restored.

References

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