Computer Science · May / June 2022 · Paper 21 · Question 1

One mark per mark point, max five

Data Structure(s), max two

MP1

arrays

MP2

variable(s) / constant(s)

Further description, max three

MP3

name(s) one or more

MP4

sample data for appropriate arrays or variables

MP5

use(s) one or more

Additional data structure description using the same data structure type, max one

MP6

two or more full descriptions of the data structure including name, sample data and use

For example:

An array (1) named FirstName (1) to store the first names of the members (1) such as James (1). A variable (1) could also be used to enter whether or not they wish to volunteer. (5 marks)

A variable (1) named FirstName (1) to input the first names of the members (1) such as James (1). A variable could also be used to enter whether or not they wish to volunteer, with sample data of ‘yes’ (1). (5 marks)

Task 1 – becoming a member of Friends of Seaview Pier

Set up a system to enable people to become members of Friends of Seaview Pier and for each new member enter:

o

the pier entrance gate

o

the gift shop

o

painting and decorating

All of this information needs to be stored using suitable data structures.

Explanation of how each was done. Code is allowed, but must be fully explained.

One mark per mark point, max three

MP1

add/use a (new) variable/array to total the membership fee money // total number of members who have paid MP2

initialise the totalling variable to 0 at the start of the program

MP3

check whether the new member has paid the $75 fee using a conditional statement

MP4

…if they have paid, and the amount paid is being totalled, add 75 to the current running total of the membership fee total

MP5

…if they have paid, and the number of paid members is being totalled, add 1 to the total number of members who have paid

MP6

…if they have paid, and the number of paid members is being totalled, multiply total by 75, to give total paid.

Any code must include a description of what it is for.

One mark per mark point, max three

Max two for just naming different appropriate validation checks

MP1

apply a presence check // to ensure that data has been entered (to the question do you want to work as a volunteer?)

MP2

apply a type check // to ensure that data has been entered of the correct data type e.g. integer if the response required is 1 or 0

MP3

checking the valid inputs would be either yes or no // apply a check to ensure that the data matches the expected input

MP4

the valid inputs would be to choose in which area the new member wishes to volunteer e.g. a list of areas MP5

if input is not valid, an error message is output (and a new input is requested)

MP6

if input is valid, the program continues

One mark per mark point, max five

MP1

input for sponsor’s name / name taken from previous data // input for message on plaque

MP2

both inputs correct with appropriate prompts // input for message on plaque correct with appropriate prompt and name taken from previous data

MP3

output of input(s) for confirmation …

MP4

… method for sponsor to confirm that the input(s) are correct

MP5

method to enable re-entry of message on plaque if errors made

MP6

charge of $200 acknowledged / charged / confirmed / displayed

MP7

(name and) message stored in arrays

MP8

array index incremented for next sponsor

Task 3 – sponsoring a wooden plank

Add an additional option to the program in Task 1 to enable the pier’s wooden planks to be sponsored. Separate data structures should be used to store the names of the individuals and the short messages they would like to have written on their brass plaque. An output would display everything that was input for the sponsor to confirm. If errors are found, the program should allow data to be re-entered. Once complete, the data is stored and the sponsor is charged $200. Example answer

ArrayIndex ← 0 //initial array's index

Check ← "N"

WHILE Check <> "Y"

OUTPUT "Enter your name"

INPUT Name

OUTPUT "Enter the message you would like on your brass plaque"

INPUT Message

OUTPUT "The data you have entered is, name: ", Name, " and your

message for the plaque is: ", Message

OUTPUT "Is this correct (Y or N)"

INPUT Check

IF Check <> "Y"

THEN

OUTPUT "The data entered is incorrect, please re-enter"

ENDIF

ENDWHILE

PlankName[ArrayIndex] ← Name

Message[ArrayIndex] ← Message

ArrayIndex ← ArrayIndex + 1

OUTPUT "The fee for this service is $200"

//some method of paying the fee or acknowledgement of the fee

Explanation of how each was done. Code is allowed, but must be fully explained.

One mark per mark point, max four

MP1

a menu is provided/options are displayed so that the user can choose which of the lists they wish to see MP2

the user inputs a number/code as shown on the menu corresponding to their menu choice

MP3

attempt to validate input

MP4

… if it does not match an option, give an error message and ask for re-input

MP5

… if it matches an option, a range of IF statements/conditional statements/CASE statement are/is used to compare the input with the available options

MP6

… output the chosen list e.g. using a loop to output the contents of the appropriate first and second name arrays corresponding to the user input

MP7

identification of empty list and appropriate action

Task 2 – using the membership data

Extend the program in Task 1 so that a list of the first and last names of members can be output in any of the following categories:

Section B