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Introduction Retail stores have been using cashier machines for almost a century to prepare bills in order to provide detail information to their customers about their purchase. In the past couple of decades, cashier machines have been replaced by computers and appropriate software known as Point of Sales (POS) with advanced capabilities varying from stock-taking to automatic discount calculation and from automatic reporting to loyalty card management. Objectives You are asked to design in C language, the software that controls a points of sales system of a cafeteria. Your program should have a basic user interface displayed on the screen of the computer and should accept command from the keyboard. The software should be able to run standalone and its usage must be self-explanatory. The program must provide both a user mode which is used during the standard operation of the POS system and an administrator mode to produce the reports earnings during a period as well as statistics on the quantity sold from each item. The system is installed in a cafeteria and operated by an appropriate operators that knows the menu including all the products.

Specifications The program should at least meet the following specifications Have two modes of operation: a user mode (UM) and an administrator mode (AM). The switch between the two modes should be done through a hidden option (also protected with a password) in the standard user menu. The switch back to UM can be done using the standard menu at AM indicated to the operator bill and it is displayed on the screen. and the bill should be finalized. Automatically, a new bill is initialized for a new client. updated in order to keep record for period reporting (visible only to AM mode) (UM) It provides a simple menu where the menu is displayed and the code of each item is clearly (UM) When an item is selected the corresponding price is added to the sub-total of the current (UM) Also the menu provides a pay option which indicates that the client is ready to check-out (UM) After each bill finalization for all items purchased the quantities sold counters should be (AM) Report the quantity sold from each item. (AM) Report the number of clients for a period (AM) Report the total earnings of a period (money collected) (AM) Provides an option to change the price of an item and informs the user that the price has been changed successfully (AM) Provides an option for ending a period and start a new one (make all quantity counters zero) (AM) Provides an option to return back to user mode (AM) Provide a menu to the administrator so it can perform all the above operations. Anything not specified above is left to you to decide.

Please only use c programming to solve this project. Feel free to ask anything, however, all details have been provided so read the text carefully.

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