WHILE loop (pre-test)

Code pattern

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Definition

WHILE condition is true ... ENDWHILE: the condition is tested before each loop, so the body may never run.

Example

WHILE count < 5 ... ENDWHILE

Found in: course specifications, past SDD papers.

Where you'll use it in the test

Syllabus area: Code patterns.

Question types it can appear in

Pseudocode: Use it correctly in the exam pseudocode editor.
Code reading: Code or algorithm reading: interpret a fragment and state its output or purpose.
Python: Python while

Where it has appeared in the paper

The Software Engineering Project (Part A, B). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

Code pattern: “WHILE condition is true ...” Then apply it: WHILE count < 5 ... ENDWHILE

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Official worked answer

Sample exam Q9 (2 marks): Algorithm design (guessing game) (2 marks): official criteria and sample answer

Criteria

2: Correctly orders the steps. 1: Correctly orders the WHILE and ENDWHILE steps.

Sample answer

Set number = random integer between 0 and 100 WHILE guess <> number Display "Guess a number between 0 and 100:" Get guess ENDWHILE Display "Well Done"

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Go deeper

Flashcard: WHILE loop (pre-test) in Code Patterns: Pseudocode, Python, SQL, CSS (Years 11 and 12) · study that set
Memorise: Python and SQL you must be able to write
Notes: Python basics: input, selection, loops, strings (Python and SQL you must be able to write)
Master answer: sdd2021-q29 (3 marks, short answer / extended) (Master model answers: The Software Engineering Project (written answers))
Full term page: every question, note and marking comment for WHILE loop (pre-test)

Check yourself

Write or say the “WHILE loop (pre-test)” pattern from memory: the syntax and what it does.

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