Need help with the below question regarding developing a C++ Program of a ATM Machine.

A bank machine that presents a menu screen for user input for each function, capable of performing deposits (adding to balance), withdrawals (in increments of 20), PIN entry verification, display current balance on screen and store in a file to print as a "receipt" upon completion, and exit. Restrictions applied to prevent withdrawal causing negative balance, withdrawals not in increments of 20, and deposits not as whole integers