Question

Q2. Consider an automated teller machine (ATM). A user slots in a card and enters a four-digit authentication code (PIN). If the PIN is incorrect the user is requested to re-enter the PIN for a maximum of three times in which case the card is returned. Otherwise, the user may perform the following operations. Deposit any amount. The ATM machine Identifies each currency note place on the Money Receiver with the aid of a sensor place in the machine (the currency note must be in Ghanaian Cedi denominations). If any of the currency notes placed on the receiver is mutilated, the sensor rejects the currency and it’s not used in the calculation of the total amount deposited. A receipt is printed showing the date, amount deposited, the various currency denominations and their sub totals and the account number. Withdraw up to GH800(the account may not be overdrawn). In addition to the money, the user is given a receipt showing the date, amount withdrawn, account number and the account balance after the withdrawal. Determine the account balance; this is displayed on the screen (the user can request for it to be printed). Transfer funds between two accounts (the account from which the funds are transferred must not be overdrawn). The user is given a receipt showing the amount transferred and the "to" and "from" account numbers. Cancel; in which case the card is returned.

a. Identify all actors in the above scenario

b. Draw a use case diagram showing all the relationship that exist between actors as well as the relationship between use cases.

c. Design an activity Diagram to model Cash Deposit.

d. Design an E-R diagram to represent the system

e. Design a sequence diagram for the above system

Answer 1

This question asks about various aspects of an automated teller machine (ATM) system, including identifying actors, creating a use case diagram, designing an activity diagram, E-R diagram, and sequence diagram.

Step-by-step explanation:

a. Identifying actors

Based on the description provided, the actors in this scenario are:

• User
• Automated Teller Machine (ATM)

b. Use case diagram

To visually represent the relationships between actors and use cases, a use case diagram can be created. However, since I am unable to draw diagrams in this text-based format, I'll describe the relationships:

• The User has the following use cases: Enter PIN, Deposit, Withdraw, Transfer Funds, Cancel
• The ATM has the following use cases: Authenticate User, Accept Deposit, Dispense Cash, Print Receipt
• Relationships exist between the User and the ATM for each of the mentioned use cases.

c. Activity Diagram for Cash Deposit

Again, I am unable to provide an actual diagram, but here is a textual representation:

1. User slots in card and enters PIN.
2. ATM authenticates the user.
3. User selects 'Deposit'.
4. User places currency notes in the ATM's Money Receiver.
5. The ATM identifies and validates the currency notes.
6. The ATM calculates the total amount deposited, excluding any mutilated currency.
7. A receipt is printed, showing the date, amount deposited, currency denominations, and account number.

d. E-R Diagram

Unfortunately, I cannot provide an E-R diagram in this text format. However, an E-R diagram represents the relationships between entities in a system. In this scenario, the entities would include User, ATM, Account, Deposit, Withdrawal, and Transfer. The relationships would include User using the ATM, Account being associated with User, and various transaction activities involving Deposit, Withdrawal, and Transfer.

e. Sequence Diagram

As with the previous diagrams, I am unable to provide an actual sequence diagram. However, a textual representation can be provided:

1. User initiates a transaction by inserting the card and entering the PIN.
2. ATM authenticates the user and presents available options.
3. User selects a transaction, such as 'Deposit'.
4. The ATM prompts the user to place currency notes on the Money Receiver.
5. The ATM identifies and validates the currency notes.
6. The ATM performs necessary calculations and updates the account balance.
7. A receipt is printed, showing the transaction details.
8. ATM returns the card to the user.