VIPSolutionsGive step-by-step solution with explanation and final answer:A typical picture of an ATM system is shown in the figure. You are given a task to develop software for such an ATM system. The manager of the bank explains the first requirements of the system: The user can open and close accounts. He or she withdraws and deposits cash. The user can view his / her accounts, and can make cash transfer between his / her accounts. Wel coma! Plasse enter your account number: 12345 san Enter your PIN: 54321 pep — Kopi Deposit Slot. The following detailed requirements are given for withdraw transaction by the bank manager to you: “After the user is authenticated with a card and password, he or she selects the withdrawal transaction. The ATM machine first displays menu of withdrawal amount and option to cancel. Then it inputs the menu selection. If the user cancels the transaction, you exit. Otherwise (user selects an amount) it sets amount attribute, gets available balance of user's account from database. If the required amount is greater than the available balance, it displays an appropriate error ‘message. Otherwise it tests whether sufficient cash is available in the cash dispenser. If there is insufficient cash in the cash dispenser, it displays an appropriate error message. Otherwise it interacts with the database to debit amount from user's account. Then it dispenses cash and instructs the user to take cash. If the user does not take the cash in 60 seconds, it takes the cash back and update the database accordingly” 2) You are given the task of developing a module to be used in ATM (Auto Teller Machine) of a Bank. What development methodology will be appropriate for this project? Why? b) Find objects and relations between objects, and draw a class diagram. Try to use inheritance and composition. ©) What kind of software architecture will be appropriate for this system?. Explan. d) Describe two OO design patter that can be used to improve the quality of this software system. Explain how thesea are usefull for this system.
Question:
Give step-by-step solution with explanation and final answer:
A typical picture of an ATM system is shown in the figure. You are given a task to develop
software for such an ATM system. The manager of the bank explains the first requirements of the
system: The user can open and close accounts. He or she withdraws and deposits cash. The user
can view his / her accounts, and can make cash transfer between his / her accounts.
Wel coma!
Plasse enter your account number: 12345
san
Enter your PIN: 54321
pep —
Kopi
Deposit Slot.
The following detailed requirements are given for withdraw transaction by the bank manager to
you:
“After the user is authenticated with a card and password, he or she selects the withdrawal
transaction. The ATM machine first displays menu of withdrawal amount and option to cancel.
Then it inputs the menu selection. If the user cancels the transaction, you exit. Otherwise (user
selects an amount) it sets amount attribute, gets available balance of user's account from database.
If the required amount is greater than the available balance, it displays an appropriate error
‘message. Otherwise it tests whether sufficient cash is available in the cash dispenser. If there is
insufficient cash in the cash dispenser, it displays an appropriate error message. Otherwise it
interacts with the database to debit amount from user's account. Then it dispenses cash and
instructs the user to take cash. If the user does not take the cash in 60 seconds, it takes the cash
back and update the database accordingly”
2) You are given the task of developing a module to be used in ATM (Auto Teller Machine) of a
Bank. What development methodology will be appropriate for this project? Why?
b) Find objects and relations between objects, and draw a class diagram. Try to use inheritance
and composition.
©) What kind of software architecture will be appropriate for this system?. Explan.
d) Describe two OO design patter that can be used to improve the quality of this software
system. Explain how thesea are usefull for this system.
This is AI generated Response.
Asked by: mohit
Created at: 2025-06-09 23:50:27
Asked by: mohit
Created at: 2025-06-09 23:50:27
Final Answer:
Rendered
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Did you like this answer?
Let's break down and answer each part step by step.
---
### **a) Development Methodology**
#### **Question:**
What development methodology will be appropriate for this project? Why?
#### **Answer:**
**Object-Oriented Software Development (OOSD) Methodology** is most appropriate for this ATM system because:
- **Modularity and Reusability:** ATM functionality (authentication, withdrawal, deposit, etc.) can be modeled as classes/objects, promoting code reuse and modularity.
- **Encapsulation:** Sensitive data (PIN, account balance) remains protected within objects.
- **Inheritance and Polymorphism:** Common behavior (e.g., transaction) can be inherited and extended for specific types (withdrawal, deposit).
- **Maintainability:** Changes in one part (e.g., cash dispenser logic) don't affect others.
- **Mapping to Real World:** ATM components (e.g., CardReader, CashDispenser) map naturally to objects.
---
### **b) Objects, Relations, and Class Diagram**
#### **Question:**
Find objects and relations between objects, and draw a class diagram. Try to use inheritance and composition.
#### **Step 1: Identify Key Objects**
- **ATM**
- **Account**
- **User**
- **Transaction (Abstract)**
- **Withdrawal (Inherits Transaction)**
- **Deposit (Inherits Transaction)**
- **Transfer (Inherits Transaction)**
- **CashDispenser**
- **DepositSlot**
- **Database**
- **Screen**
- **Keypad**
- **CardReader**
#### **Step 2: Relationships**
- **ATM** aggregates/composes: Screen, Keypad, CashDispenser, DepositSlot, CardReader, Database.
- **User** has one or more **Account(s)**.
- **Transaction** operates on **Account**.
- **ATM** initiates **Transaction**.
#### **Step 3: Class Diagram (Textual Representation)**
```
+---------------------+
| ATM |
+---------------------+
| - screen |
| - keypad |
| - cashDispenser |
| - depositSlot |
| - cardReader |
| - database |
+---------------------+
| + authenticate() |
| + performTransaction()|
+---------------------+
+---------------------+
| User |
+---------------------+
| - accounts[] |
+---------------------+
| + selectAccount() |
+---------------------+
+---------------------+
| Account |
+---------------------+
| - balance |
| - accountNumber |
+---------------------+
| + debit() |
| + credit() |
+---------------------+
+---------------------+
| Transaction | <--- (Abstract class)
+---------------------+
| - amount |
+---------------------+
| + execute() |
+---------------------+
/ | \
/ | \
Withdrawal Deposit Transfer (Inherit Transaction)
+----------------------+
| CashDispenser |
+----------------------+
| + dispenseCash() |
| + hasSufficientCash()|
+----------------------+
+----------------------+
| DepositSlot |
+----------------------+
| + acceptEnvelope() |
+----------------------+
+----------------------+
| Screen |
+----------------------+
| + displayMessage() |
+----------------------+
+----------------------+
| Keypad |
+----------------------+
| + getInput() |
+----------------------+
+----------------------+
| CardReader |
+----------------------+
| + readCard() |
+----------------------+
+----------------------+
| Database |
+----------------------+
| + getBalance() |
| + updateBalance() |
+----------------------+
```
**Inheritance:** `Withdrawal`, `Deposit`, `Transfer` inherit from `Transaction`.
**Composition/Aggregation:** `ATM` has (composes) `Screen`, `Keypad`, etc.
---
### **c) Software Architecture**
#### **Question:**
What kind of software architecture will be appropriate for this system? Explain.
#### **Answer:**
**Layered (N-tier) Architecture** is most suitable:
- **Presentation Layer:** Handles input/output (Screen, Keypad).
- **Business Logic Layer:** Contains ATM logic (Transaction management, Authentication, Error Handling).
- **Data Access Layer:** Interfaces with Database to fetch/update account information.
**Benefits:**
- **Separation of concerns:** Changes in UI don’t affect business logic or data access.
- **Maintainability:** Easy to modify or extend individual layers.
- **Scalability:** Each layer can be updated or scaled independently.
---
### **d) Object-Oriented Design Patterns**
#### **Question:**
Describe two OO design patterns to improve the quality of this software system. Explain their usefulness.
#### **Answer:**
**1. Singleton Pattern (for Database Connection):**
- **Problem:** Only one instance of the database connection should exist.
- **Implementation:** Singleton ensures a single, shared instance.
- **Usefulness:** Prevents multiple conflicting connections, saves resources, centralizes control.
**2. State Pattern (for ATM State Management):**
- **Problem:** ATM operates in various states (Idle, Card Inserted, Authenticated, Transaction, Out of Service).
- **Implementation:** State pattern allows the ATM to change its behavior based on its current state, encapsulating each state as an object.
- **Usefulness:** Simplifies state transitions, makes code easier to understand and extend (e.g., adding new states like "Maintenance").
---
### **Summary Table**
| Part | Solution/Explanation |
|------|---------------------|
| a) | Use Object-Oriented Software Development methodology. |
| b) | Identify objects (ATM, User, Account, Transaction, etc.), draw class diagram using inheritance and composition. |
| c) | Apply Layered (N-tier) Architecture for separation of concerns and scalability. |
| d) | Use Singleton (for Database), State (for ATM states) patterns for maintainability and flexibility. |
---
**If you need a graphical class diagram, let me know and I can provide one!**
Question:
yes i need a graphical class diagram
This is AI generated Response.
Asked by: mohit
Created at: 2025-06-09 23:54:35
Asked by: mohit
Created at: 2025-06-09 23:54:35
Final Answer:
Rendered
Raw Text
Did you like this answer?
Certainly! Here's a graphical representation of the class diagram based on the objects and relationships discussed:
```plaintext
+--------------------------------------------------+
| ATM |
+--------------------------------------------------+
| - screen: Screen |
| - keypad: Keypad |
| - cashDispenser: CashDispenser |
| - depositSlot: DepositSlot |
| - cardReader: CardReader |
| - database: Database |
+--------------------------------------------------+
| + authenticate(): bool |
| + performTransaction(): void |
+--------------------------------------------------+
| 1
|
| uses / aggregates
v
+--------------------------------------------------+
| User |
+--------------------------------------------------+
| - userID: String |
| - accounts: List<Account> |
+--------------------------------------------------+
| + selectAccount(): Account |
+--------------------------------------------------+
| 1
| owns
v
+--------------------------------------------------+
| Account |
+--------------------------------------------------+
| - accountNumber: String |
| - balance: float |
+--------------------------------------------------+
| + debit(amount: float): bool |
| + credit(amount: float): void |
+--------------------------------------------------+
|
| operates on
v
+--------------------------------------------------+
| Transaction | (Abstract)
+--------------------------------------------------+
| - amount: float |
+--------------------------------------------------+
| + execute(): bool |
+--------------------------------------------------+
/ | \
/ | \
+----------------+ +--------------+ +--------------+
| Withdrawal | | Deposit | | Transfer |
+----------------+ +--------------+ +--------------+
| + execute(): bool| + execute(): bool| + execute(): bool|
+----------------+ +--------------+ +--------------+
(Note: Inheritance from Transaction)
| 1
| creates / interacts
v
+--------------------------------------------------+
| CashDispenser |
+--------------------------------------------------+
| + dispenseCash(amount: float): void |
| + hasSufficientCash(amount: float): bool |
+--------------------------------------------------+
+--------------------------------------------------+
| DepositSlot |
+--------------------------------------------------+
| + acceptEnvelope(): bool |
+--------------------------------------------------+
+--------------------------------------------------+
| Screen |
+--------------------------------------------------+
| + displayMessage(message: String): void |
+--------------------------------------------------+
+--------------------------------------------------+
| Keypad |
+--------------------------------------------------+
| + getInput(): String |
+--------------------------------------------------+
+--------------------------------------------------+
| CardReader |
+--------------------------------------------------+
| + readCard(): String |
+--------------------------------------------------+
+--------------------------------------------------+
| Database |
+--------------------------------------------------+
| + getBalance(accountNumber: String): float |
| + updateBalance(accountNumber: String, newBalance: float): void |
+--------------------------------------------------+
```
---
### **Notes on the Diagram:**
- **Inheritance:** `Withdrawal`, `Deposit`, and `Transfer` inherit from `Transaction`.
- **Associations:**
- The `ATM` uses various hardware components.
- `User` owns `Account` objects.
- `Transaction` operates on `Account`.
- **Composition:** The `ATM` is composed of hardware components.
- **Multiplicity:** For simplicity, one ATM interacts with many accounts and users; transactions are initiated per session.
This diagram provides a clear picture of the system's object structure, relationships, and inheritance. If you'd like, I can generate a formal UML diagram using diagramming tools as well!
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