Ready to explore the features of Eiffel programming? In this blog post, we'll tackle a programming assignment that involves creating a basic bank account system. This assignment will test your understanding of contracts, classes, and assertions in Eiffel. If you need help with Eiffel assignment or have any questions, feel free to ask for assistance.

Problem Description

The Task:
Your mission is to write Eiffel code to implement a basic bank account system. Create an Account class with methods for depositing, withdrawing, and checking the balance. Implement contracts using assertions to ensure the consistency and correctness of the account operations.

How to Approach the Problem:
Let's break down the problem into manageable steps:

Step 1: Account Class
Create an Account class in Eiffel. Define attributes for the account balance and methods for depositing, withdrawing, and checking the balance.

Step 2: Contracts
Implement contracts using assertions to define the preconditions and postconditions for each method. Ensure that the account balance remains non-negative after withdrawals.

Step 3: Testing
Test your implementation by creating instances of the Account class and performing various deposit and withdrawal operations. Use assertions to check that the contracts are not violated.

Example
Let's walk through a sample scenario to solidify your understanding. The provided Eiffel solution serves as a guide to help you implement your own solution. Understand the logic behind each step and adapt it to your programming style.

<sub>class
ACCOUNT

create
make

feature

balance: REAL

make
-- Initialize account with a zero balance.
do
balance := 0.0
end

deposit (amount: REAL)
-- Deposit the given amount into the account.
require
positive_amount: amount > 0
ensure
balance_increased: balance = old balance + amount
do
balance := balance + amount
end

withdraw (amount: REAL)
-- Withdraw the given amount from the account.
require
non_negative_balance: amount <= balance
ensure
balance_decreased: balance = old balance - amount
do
balance := balance - amount
end

check_balance: REAL
-- Return the current balance of the account.
do
Result := balance
end

end</sub>

Conclusion

This programming assignment provides an opportunity to dive into Eiffel's unique approach to design by contract. As you implement the bank account system, you'll not only strengthen your Eiffel programming skills but also gain practical experience in ensuring program correctness through contracts and assertions.

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