Computer Science · Oct / Nov 2020 · Paper 22 · Question 1

Any meaningful name for an array related to Task 1 – one mark e.g. SysStore

SysPrice

Correct purpose related to Task 1 – one mark e.g.

…to store the system (components) that have been purchased

…to store the (total) price of the system (being purchased)

Any meaningful name for a variable related to Task 2 – one mark e.g. Component

TotalPrice

Correct purpose related to Task 2 - one mark e.g.

… to allow input of a component code

… to store/calculate the running total price of the system

Any meaningful name for a constant related to Task 3 – one mark e.g. Offer5

Offer10

Correct purpose related to Task 3 - one mark e.g.

… to store the one option discount rate

… to store the two-option discount rate

Mark as either:

Two distinct different points

OR

One point and an expansion

Example answers:

Real data can be used in calculations directly (which is required of the Price data) (1)

Data can be stored with decimal places (1)

Real numbers can be used in calculations (1) which is not possible with strings (1)

Any six from:

MP1

At least one input (case, RAM, HDD)

MP2

All three inputs fully prompted

MP3

An attempt at validation of input

MP4

One complete validation of input with error message

MP5

Finding the price for one chosen item

MP6

Finding the prices of the other two chosen items correctly

MP7

Calculation of price of the chosen items

MP8

…add the basic components cost to the cost of the chosen items MP9

Storage of chosen items

MP10

Output to show chosen items and price of the computer (with appropriate message)

Example answer:

OUTPUT "Which type of Case would you like? Input the Item Code"

ComponentFlag ← False

WHILE ComponentFlag = False

INPUT CaseCode

Count ← 0

WHILE Count<2 DO

IF CaseCode = ComponentCode[Count]

THEN

CaseIndex ← Count

ComponentFlag ← True

Count ← 2

ENDIF

Count ← Count + 1

ENDWHILE

IF ComponentFlag = False

THEN

OUTPUT "Your case Item Code doesn’t exist, please try again"

ENDIF

ENDWHILE

OUTPUT "Which type of RAM would you like? Input the Item Code"

ComponentFlag ← False

WHILE ComponentFlag = False

INPUT RAMCode

Count ← 2

WHILE Count<5 DO

IF RAMCode = ComponentCode[Count]

THEN

RAMIndex ← Count

ComponentFlag ← True

Count ← 5

ENDIF

Count ← Count + 1

ENDWHILE

IF ComponentFlag = False

THEN

OUTPUT "Your RAM Item Code doesn’t exist, please try again"

ENDIF

ENDWHILE

OUTPUT "Which type of Primary Hard Disk Drive would you like? Input the Item Code"

ComponentFlag ← False

WHILE ComponentFlag = False

INPUT PHDDCode

Count ← 5

WHILE Count<8 DO

IF PHDDCode = ComponentCode[Count]

THEN

HDDIndex ← Count

ComponentFlag ← True

Count ← 8

ENDIF

Count ← Count + 1

ENDWHILE

IF ComponentFlag = False

THEN

OUTPUT "Your Primary HDD Item Code doesn’t exist, please try again"

ENDIF

ENDWHILE

TotalPrice ← 200 + ComponentPrice[CaseIndex] +

ComponentPrice[RAMIndex] + ComponentPrice[HDDIndex] OUTPUT "Your computer consists of ",

Description[CaseIndex], " case, ", Description[RAMIndex], " RAM and ", Description[HDDIndex], " Primary Hard Disk Drive."

OUTPUT "The total price of your computer is $", TotalPrice

Any four from:

MP1

Explanation of how the number of additional parts is stored MP2

Explanation of counting of additional parts being added to the system MP3

Explanation of determination of additional parts being 1, or more than 1

MP4

Explanation of using the correct percentage discount

MP5

Explanation of calculating the money saved and finding the new price MP6

Explanation of correct output of money saved and new price

Any two from:

MP1

Prompt and input to ask buyer how many computers they wish to purchase (at the start) // When the first computer is complete, prompt and input to ask if they would like to purchase another computer MP2

Introduce an appropriate loop structure

MP3

New storage for more than one computer // Enable the ordering of multiple computers of the same specification

Section B