O Level Computer Science 2210 Paper 22, May/June 2026

Presence (check)

Check digit

To check that the input matches a specified / required style / pattern / structure

… by containing set numbers of letters and numbers // … by containing specified groups of digits // … by containing specific characters within the text

An example of a format e.g. date format dd/mm/yyyy

Appropriate loop to iterate for 15 inputs

Input of a number

Test if the input is an integer e.g. use of MOD, DIV or ROUND functions

Repeated re-input if number not an integer, until it is an integer

Store integer in the correct array location

At least two outputs seen, from input prompt / error message / completion message.

Writing the program code in a programming/coding language

… using pseudocode/flowcharts/structure diagrams from the design/earlier stage to create your code

Documenting your code with comments // making sure your code is maintainable

Writing procedures/functions // Use library routines/functions

Using a compiler/interpreter/IDE when writing the code

Testing the code in small parts as you write it allow iterative testing

… to ensure that it works correctly / as expected // … to refine your code

The final stage of testing the whole program for errors

Use of test data with known outcomes

… to ensure the whole program produces the expected outcomes (from the test data) // … to make sure the program accepts valid data and rejects invalid data

Correct errors // debug the code

Allow one mark max for identifying at least two types of test data e.g. normal, abnormal, boundary, extreme

Line 03 / DECLARE AccountID : INTEGER should be DECLARE AccountID : STRING

Line 05 / OUTPUT AccountID should be INPUT AccountID

Line 07 / CASE OF AccountID = Accounts[Row, 1] should be IF AccountID = Accounts[Row, 1]

Line 09 / OUTPUT "The customer’s name is ", Accounts[1, 2] should be OUTPUT "The customer’s name is ", Accounts[Row, 2]

Linear search

Use/initialise a flag at the start / before line 06

Flag ← FALSE // Flag ← 0

Between lines 08 and 10 (where the item has been found)

Flag ← TRUE // Flag ← 1

Outside the loop / after line 11 add another selection statement and output

IF Flag = False …

… THEN OUTPUT "Account number not found in the array" ENDIF

Replace lines 06 and 11 and increment counter before line 11

WHILE NOT Flag AND Row <= 1000 (DO)

Row ← Row + 1 and ENDWHILE

Word column correct

WordLength column correct

Count column correct

NumLetter column correct

Choice column correct

OUTPUT column correct

Counting/outputting the number of double/repeated/pairs of letters in a word

So the data is stored permanently // provides a non-volatile copy

So the data is not lost if the machine/program is switched off/crashes

So the data can be used again later // to provide a backup

So the data can be transported to a different (offline) computer // so the data can be shared

Declaration of an appropriately named variable

Correct statement to open Names.txt for reading

Correct statement to read data from the file into a variable

Correct statement to close Names.txt

NAND gate with inputs A and B

NOT gate with input C

NOR gate with input B and output of NOT gate

NOT gate with output of NOR gate

XOR gate with output of NAND gate and output of NOT gate leading to Z

Four marks for eight correct outputs (Three marks for six or seven correct outputs; Two marks for four or five correct outputs; One mark for two or three correct outputs)

First two correct data types

Second two correct data types

Third two correct data types

Fourth two correct data types

At least two correct fields in SELECT row

Remaining correct field in SELECT row

Correct FROM CAR_PARTS

Correct WHERE PartName = "brake pads";

There is an alternative field NumberInStock

… a value of 0 in this field indicates the item is out of stock // … a positive value in this field indicates the item is in stock // … this field indicates the quantity in stock

AO2: Apply knowledge and understanding of the principles and concepts of computer science to a given context, including the analysis and design of computational or programming problems (maximum 9 marks)

AO3: Provide solutions to problems by: evaluating computer systems, making reasoned judgements, presenting conclusions (maximum 6 marks)