c++ programming. if you would please write some comments to explain how it was solved. thank you!

question:

You are given a task to write a program with at least FIVE (5) functions inclusive of function main (using pass-by-value, pass-by-reference, combination of both and loop) that let the user enters the type of transaction, balance and amount. The program should calculate and display the balance of account based on the criteria below. Type of Transaction Balance Deposit balance = balance + amount Withdraw balance = balance - amount