It's due by the end of the day, today at 12 am Central.

Okay, I need help with my final assignment in c++. It's due by the end of the day, today at 12 am Central. I need help with adding the ability to save data to a disk in one or more files. The menu(s) should give the user the option to save or retrieve data in my financial calculator program that I've been working on. I have no clue how or where to begin at but here is the code I have right now: