At a skating rink, a ticket program checks whether a visitor qualifies for a child price. The visitor's age is entered as an integer in age. Child tickets a...
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At a skating rink, a ticket program checks whether a visitor qualifies for a child price. The visitor's age is entered as an integer in age. Child tickets are available to players and visitors who are under 13 years old. The skeleton program includes this command:
IF age < 13 THEN
price = 4.50
ENDIF
The manager wants the displayed price to be correct before a receipt is printed.
(a) Explain what the < relational operation tests. [1]
(b) When age is 13, state whether the statement in the IF block is carried out. [1]
(c) When the age is 12, explain why the assignment to price is carried out. [1]
In the dispatch program of a bicycle repair service, a mechanic enters the number of completed repairs into repairs. A bonus message is displayed only when the mechanic has completed between 12 and 20 repairs inclusive. The programmer must use relational operations in one selection statement.
(a) When repairs is 12, explain the result of repairs >= 12. [1]
(b) When repairs is 21, explain the result of repairs <= 20. [1]
(c) When both limits must be tested, write a complete condition using AND. [2]
Answer Details
Skating-rink program
<tests whether the value on its left is less than the value on its right. Here it tests whetherageis less than 13. [1]- At age 13,
age < 13is false, so the statement inside theIFblock is not carried out. [1] - At age 12,
12 < 13is true. Therefore the condition is true andprice = 4.50is carried out. [1]
Bicycle-repair program
repairs >= 12is true whenrepairsis 12, because>=includes the boundary value. [1]repairs <= 20is false whenrepairsis 21, because 21 is greater than 20. [1]- Both ends of the inclusive range must be true, so use:
repairs >= 12 AND repairs <= 20[2]
Use AND for a value that must be within a range: it must be at least the lower limit and no more than the upper limit.
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