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Authors:
Anany Levitin
Chapter:
Introduction
Exercise:
1.2 Exercise
Question:6 | ISBN:9780132316811 | Edition: 3

Question

Describe the algorithm used by your favorite ATM machine in dispensing cash. (You may give your description in either English or pseudocode, whichever you find more convenient.)

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Answer

One possible algorithm used by an ATM machine in dispensing cash can be described is as follows:

  1. Read the customer's input:

    • Prompt the customer to enter the desired amount of cash to withdraw.
    • Read and validate the input to ensure it is a valid numerical value.

  2. Check the availability of funds:

    • Verify if the ATM has sufficient funds to fulfill the withdrawal request.
    • If the ATM does not have enough funds, display an error message and end the transaction.

  3. Determine the denominations:

    • Determine the optimal combination of denominations to dispense the requested amount.
    • Start with the highest denomination and progressively move to lower denominations.

  4. Calculate the number of bills for each denomination:

    • Divide the requested amount by the value of each denomination to determine the number of bills needed for that denomination.
    • Subtract the dispensed amount for each denomination from the requested amount.

  5. Dispense the cash:

    • Begin the cash dispensing process by activating the appropriate mechanisms.
    • For each denomination, dispense the calculated number of bills.
    • Display appropriate messages indicating the amount of cash being dispensed and the denominations used.

  6. Update the ATM balance:

    • Subtract the dispensed amount from the ATM's available balance.
    • Store the updated balance for future transactions.

  7. End the transaction:

    • Display a message indicating the successful completion of the transaction.
    • Prompt the customer if they require any additional services.
    • If not, return the ATM to the initial state and wait for the next customer.
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