In this assignment is to simulate an ATM machine. Program should able to do the following operations:
A. Create accounts for the users. A user account is created using User ID and Password. Every user has unique User ID and Password.
B. A user should able to login using his User ID and Password.
C. A user can quit the program.
D. Provision to Delete a User

Initially there are no users. There program should prompt for the following option:
1) New Account,
2) Login,
3) Quit and
4) Delete an Account

Depending upon the option selected necessary action to be taken. New Account option adds a user account. When a user is added then the total number of users is increased by one. For successful Login option user will be able to do the following:
a) Withdraw money,
b) Deposit money, and
c) Request balance,
For unsuccessful Login, the program displays a message “Login or Password Did Not Match, Try Again” and prompts the initial four options. When a Delete an Account option is selected, the program prompts for: User ID, Password to be deleted. On deleting a user the number of users is reduced by one. Quit option terminates the program.
The program to run infinitely until a user quits the program. Total numbers of users are unknown. Select a suitable data structure to implement. The program should able to display the following when requested for:
(i) Number of users and Total deposit,
(ii) Deposit for Given User ID
(iii) Transaction Details for a Given User ID

Select appropriate Class, Member function and Data Members for your program