Bank Account
You're designing a simple banking system that handles operations on bank accounts. The system should be capable of the following features:
- input banking transactions
- calculate interest
- printing account statement
All the example below assumes console input/output is used.
When launching the application, it prompts user for actions:
Welcome to AwesomeGIC Bank! What would you like to do?
[T] Input transactions
[I] Define interest rules
[P] Print statement
[Q] Quit
>
User should be able to enter T or t to select input transactions menu. Similarly, initial character is used for other options.
Input transactions
Upon selecting Input transactions option, application prompts user for transaction details.
Please enter transaction details in <Date> <Account> <Type> <Amount> format
(or enter blank to go back to main menu):
>
User is then able to enter something like the following:
20230626 AC001 W 100.00
Some constraints to note: * Date should be in YYYYMMdd format * Account is a string, free format * Type is D for deposit, W for withdrawal, case insensitive * Amount must be greater than zero, decimals are allowed up to 2 decimal places * An account's balance should not be less than 0. Therefore, the first transaction on an account should not be a withdrawal, and any transactions thereafter should not make balance go below 0 * Each transaction should be given a unique id in YYYMMdd-xx format, where xx is a running number (see example below)
Then system responds by displaying the statement of the account: (assuming there are already some transactions in the account)
Account: AC001
| Date | Txn Id | Type | Amount |
| 20230505 | 20230505-01 | D | 100.00 |
| 20230601 | 20230601-01 | D | 150.00 |
| 20230626 | 20230626-01 | W | 20.00 |
| 20230626 | 20230626-02 | W | 100.00 |
Is there anything else you'd like to do?
[T] Input transactions
[I] Define interest rules
[P] Print statement
[Q] Quit
>
Define interest rule
Upon selecting Define interest rule option, application prompts user to define interest rules:
Please enter interest rules details in <Date> <RuleId> <Rate in %> format
(or enter blank to go back to main menu):
>
User is then able to enter something like the following:
20230615 RULE03 2.20
Then system responds by listing all interest rules orderd by date: (assuming there are already RULE01 and RULE02 in the system)
Interest rules:
| Date | RuleId | Rate (%) |
| 20230101 | RULE01 | 1.95 |
| 20230520 | RULE02 | 1.90 |
| 20230615 | RULE03 | 2.20 |
Is there anything else you'd like to do?
[T] Input transactions
[I] Define interest rules
[P] Print statement
[Q] Quit
>
Print Statement
Upon selecting Print statement option, application prompts user to select which account to print the statement for:
Please enter account and month to generate the statement <Account> <Year><Month>
(or enter blank to go back to main menu):
>
When user enters the account
AC001 202306
System then responds with the following account statement, which shows all the transactions and interest for that month (transaction type for interest is I):
Account: AC001
| Date | Txn Id | Type | Amount | Balance |
| 20230601 | 20230601-01 | D | 150.00 | 250.00 |
| 20230626 | 20230626-01 | W | 20.00 | 230.00 |
| 20230626 | 20230626-02 | W | 100.00 | 130.00 |
| 20230630 | | I | 0.39 | 130.39 |
How to apply the interest rule: * Interest is applied on end of day balance
| Period | Num of days | EOD Balance | Rate Id | Rate | Annualized Interest |
| 20230601 - 20230614 | 14 | 250 | RULE02 | 1.90 | 250 * 1.90% * 14 = 66.50 |
| 20230615 - 20230625 | 11 | 250 | RULE03 | 2.20 | 250 * 2.20% * 11 = 60.50 |
| 20230626 - 20230630 | 5 | 130 | RULE03 | 2.20 | 130 * 2.20% * 5 = 14.30 |
(this table is provided to help you get an idea how the calculation is done, it should not be displayed in the output)
Quit
When user chooses to quit, user enters:
q
System responds with:
Thank you for banking with AwesomeGIC Bank.
Have a nice day!