Compiler's stages perform their main functions? Each step should be shown.

Why is defining functions so important when writing code?

Local declarations are those that are stored in the computer's memory, but how are they stored? Using local declarations is unnecessary if the same goal can be accomplished without them. When reference parameters may be used in any function, why bother with value parameters? When it comes to processing programme data, how important are value parameters?

What are the challenges and best practices in debugging programs with deeply nested or highly interconnected functions?

Create a c++ program to automate the point of sale system in a stationery store The program should be a menu-driven program that allows users to-Add information about stationery.-Update information about stationery.-View the different stationery in the store-Select multiple stationery from the list and determine the quantity to purchase.-Calculate the total and display the amount needed.-View the transaction history.-Exit from the program.An array structure should be used to keep a record of all stationery. Identify and determine the appropriate members of this structure. Your program can start with a few stationery records to initialize this array. Each record must be tracked with a pointer. Remember to update the number of records each time a purchase is made. Use a function to execute each option provided in the menu (except the exit option). Information about each transaction performed needs to be saved in a file. Your program should also consider data validation.