Computer Science · Oct / Nov 2023 · Paper 21 · Question 8
0478
As printed in the paper
The question as text
A programmer is designing an algorithm to calculate the cost of a length of rope. The program requirements are: • input two values: the length of rope in metres Length and the cost of one metre Cost • perform a validation check on the length to ensure that the value is between 0.5 and 6.0 inclusive • calculate the price Price • output the price rounded to two decimal places. Use the variable names given.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
8(a)[1]
Range check
8(b)[6]
One mark for each of the following points
START
correct use of flowchart symbolsworking flow lines and completeboth inputs correctINPUT Length
working range checkworking calculationcorrect output rounded to two decimal placesIs Length >=0.5
No
AND Length <=
6.0 ?
Yes
INPUT Cost
Price ← Length * Cost
OUTPUT
"Price ",
ROUND(Price,2)
STOP
8(c)[4]
One mark for set of test data, one mark for purpose (max four)
Example:
1 and 1 (1) normal data to ensure the algorithm accepts this test data (1)
–1 and 1 (1) abnormal data for length to ensure that it is rejected (1)
8(d)[3]
One mark for two correct headings
Two marks for three correct headings
Three marks for all headings correct and no other headings unless used in 8(b)
Length
Cost
Price
OUTPUT
8(e)[2]
One mark for each point (max two)
validate Cost …… with a range/presence checkadd another validation check for Length
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