Computer Science · Oct / Nov 2021 · Paper 22 · Question 1

One mark per point

PassengerID// StartStage

Storing the unique ID number of the passenger// Storing/inputting the start stage of the journey

One mark per point

MP1 Name of array

MP2 Data type of array

MP3 Sample data for array

MP4 Use of array

MP5 At least two complete arrays with all of the above

Array name

Data type Sample data Use

JourneyStage1 string

C1

to store the code for the home to start station

PriceStage1 real

1.50

to store the price of first stage of the journey

One mark per bullet point

MP1

Use of validation check, e.g. range check, type check, presence check, length check, format check

MP2

Use of conditional statement to check if the validation fails ...

MP3

… a re-entry is requested

MP4

Use of loop to repeat the process until an acceptable answer is input

MP5

More than one appropriate validation check used / described.

Any six from:

MP1

Conditional statement to check departure time against 10:00

MP2

… calculate 40% discount // calculate 60% of the original price

MP3

… calculate discounted total price

MP4

Output the discounted total price

MP5

Output the booking details with suitable messages

MP6

Input with prompt for passenger confirmation …

MP7

… attempt at action following the confirmation input

MP8

Repeating booking data entry if incorrect

MP9

Re-checking journey details for correctness

Example answer

// Tasks 1 and 2 completed

IF CollectedTime[Index] > 10:00

THEN

JourneyCost[Index] ← JouneyCost[Index] * 0.6

ENDIF

PRINT "Your journey cost is: ", JourneyCost[Index]

PRINT "Your journey details are: ", PassengerID[Index], JourneyTime[Index],

JourneyCodes[Index], JourneyID[Index]

PRINT "Are these details correct? (Y or N)"

INPUT Correct

IF Correct = "N"

THEN

WHILE Correct = "N"

PRINT "Re-enter your journey details"

PRINT "Correct passenger ID "

INPUT PassengerID[Index]

PRINT "Correct journey time "

INPUT JourneyTime[Index]

PRINT "Correct journey codes "

INPUT JourneyCodes[Index]

PRINT "Your revised journey details are: ", PassengerID[Index],

JourneyTime[Index], JourneyCodes[Index]

PRINT "Are these details correct? (Y or N)"

INPUT Correct

ENDWHILE

ENDIF

//Program continues

Explanation of how each of the following could be done

Any four from:

MP1

Declaring/using a counter to store the number of bookings for each passenger

MP2

Updating the counter for the number of bookings made by each passenger

MP3

Attempt to check the number of bookings …

MP4

… for the correct condition e.g. if the number of bookings is more than 10 / equal to 10

MP5

Apply the extra discount to the total price of future journeys

Section B