When a customer using an ATM (cash machine) enters their PIN number incorrectly three times, the card is not returned to the customer. This security procedure can be written into the software by a programmer using selection and iteration.Explain how selection and iteration are used in the ATM system described.[4]
Question
When a customer using an ATM (cash machine) enters their PIN number incorrectly three times, the card is not returned to the customer. This security procedure can be written into the software by a programmer using selection and iteration.Explain how selection and iteration are used in the ATM system described.[4]
Solution
Selection and iteration are two fundamental concepts in programming that can be used to implement the ATM system described.
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Selection: This is used to make decisions in the code. In the context of the ATM system, when a customer enters their PIN, the system needs to check if the entered PIN matches the correct one. This is done using a selection statement, often an "if" statement. If the entered PIN is correct, the customer can proceed. If it's incorrect, the system needs to respond accordingly.
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Iteration: This is used to perform a certain action repeatedly. In the context of the ATM system, after the customer enters an incorrect PIN, the system needs to allow the customer to try again. This is done using an iteration statement, often a "for" or "while" loop. The system can be programmed to allow the customer to enter their PIN up to three times. If the customer enters the wrong PIN three times, the iteration would end, and the card would not be returned.
So, in summary, selection is used to check the correctness of the entered PIN, and iteration is used to allow the customer multiple attempts to enter their PIN correctly.
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