Ex 17: Atm Withdrawal Simulator

Problem​

Simulate a backend feature for an ATM. Customers can request multiple withdrawals during a session. Handle each request based on the current account balance.

Rules​

• Define simulate_atm_withdrawals(balance: int, withdrawals: list[int]) -> list[str].
• Use a while loop with a manual index to process the withdrawals.
• Update the balance after each successful withdrawal.
• Return the full list of log messages, including the final balance.

Boilerplate​

Copy below code and paste to our IDE for head start.

# Write our code inside this function
def simulate_atm_withdrawals(balance: int, withdrawals: list[int]) -> list[str]:
    pass # remove this

# Call with test data
print(simulate_atm_withdrawals(200, [100, 500, 50]))

Expected Output​

['Withdrawn: 100', 'Insufficient funds for requested amount: 500', 'Withdrawn: 50', 'Remaining Balance: 50']

Solution​

Only view the solution after trying our best.

def simulate_atm_withdrawals(balance: int, withdrawals: list[int]) -> list[str]:
    result: list[str] = []
    index: int = 0

    while index < len(withdrawals):
        amount = withdrawals[index]
        if amount <= balance:
            balance -= amount
            result.append(f"Withdrawn: {amount}")
        else:
            result.append(f"Insufficient funds for requested amount: {amount}")
        index += 1

    result.append(f"Remaining Balance: {balance}")
    return result

# Test call
print(simulate_atm_withdrawals(200, [100, 500, 50]))