The food-delivery program checks a discount voucher before the order is confirmed. A voucher is valid when the customer is new, or when the order total is a...
Question 1 Report
The food-delivery program checks a discount voucher before the order is confirmed. A voucher is valid when the customer is new, or when the order total is at least 30 pounds and the customer has entered a loyalty code. The comparisons and input check return Boolean values. The programmer proposes validVoucher = newCustomer OR (largeOrder AND loyaltyCode). A test user is not new, has a large order, and has entered no loyalty code. Another user is new with a small order and no code.
(a) Explain why the large-order and loyalty-code tests are joined by AND. [2]
(b) When the first test user has values False, True, False, state the value of validVoucher. [1]
(c) When the second user has values True, False, False, state the value of validVoucher. [1]
(d) Explain one reason for using brackets in this statement. [2]
Answer Details
The condition is newCustomer OR (largeOrder AND loyaltyCode). AND requires both inputs to be True; OR requires at least one input to be True.
- (a) A returning customer must have a large order. [1] They must also have entered a loyalty code. [1] Therefore these two checks are joined by
AND. - (b) For False, True, False:
largeOrder AND loyaltyCodeis False, andFalse OR Falseis False. [1] - (c) For True, False, False: the new-customer condition is already True, so
True OR (...)is True. [1] - (d) The brackets group
largeOrder AND loyaltyCodeinto one condition. [1] That grouped result is then combined withnewCustomerusingOR, making the intended logic clear. [1]
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