← QCE Digital Solutions Unit 1

Repeat-Until loop

A loop that repeats its instructions and checks the condition after each repetition, so the body always runs at least once

Part of: QCE Digital Solutions Unit 1 — Algorithms and Programming Techniques — Module 26, QCE Digital Solutions Unit 2 — Data-Driven Problems and Solution Requirements — Module 104, QCE Digital Solutions Unit 2 — Data and Programming Techniques — Module 137, QCE Digital Solutions Unit 2 — Prototype Data Solutions — Module 57, QCE Digital Solutions Unit 3 — Real-World Problems and Solution Requirements — Module 69, WA Computer Science ATAR Year 11 — Pseudocode and Algorithm Design — Module 29, WA Computer Science ATAR Year 11 — Control Structures and Data Types — Module 47

Understanding Repeat-Until loop in QCE Digital Solutions Unit 1

What it does: This description matches a REPEAT-UNTIL loop, a post-test loop. REPEAT begins the loop, marking where the repeated instructions start. UNTIL introduces the condition that is checked at the end of each repetition. The loop keeps repeating until the UNTIL condition evaluates to true, at which point it stops. VCAA pseudocode uses the arrow ← for assignment, not the equals sign.

Common mistakes: A REPEAT-UNTIL loop closes with UNTIL followed by the condition, not END UNTIL. VCAA pseudocode uses DISPLAY to output a value, not PRINT.

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Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 158–380) and word search (Modules 82–380).

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Learning
Duo
Does a REPEAT-UNTIL loop's body always run at least once?
TrueFalse
Matches
count ← 0 REPEAT DISPLAY count count ← count + 1 END UNTIL count = 3
↓
The loop should close with UNTIL and its condition, not END UNTIL
Applying
Meanings
Term
REPEAT ... UNTIL condition
Meaning
A loop that repeats its instructions and checks the condition after each repetition, so the body always runs at least once
Practice
BEGIN
Testing
Gaps
Check Answer
Spots
4 count ← count + 1
5END UNTIL count > 5

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Quick Questions

1. Does a REPEAT-UNTIL loop's body always run at least once?
A. True ✓
B. False
Since the condition is checked after the loop body runs, REPEAT-UNTIL always executes the body at least once.
2. Which keyword introduces the condition checked after each repetition?
A. UNTIL ✓
B. WHILE
UNTIL introduces the condition that is checked at the end of each repetition.
3. Does a REPEAT-UNTIL loop check its condition before or after the loop body runs?
A. Before
B. After ✓
REPEAT-UNTIL is a post-test loop, checking the condition after the body has run.
4. Does a REPEAT-UNTIL loop stop once its UNTIL condition becomes true?
A. True ✓
B. False
The loop keeps repeating until the UNTIL condition evaluates to true, at which point it stops.
5. Is REPEAT-UNTIL a pre-test or post-test loop?
A. Pre-test
B. Post-test ✓
REPEAT-UNTIL checks its condition after the loop body, making it a post-test loop.

Match the Pairs

REPEAT DISPLAY count count ← count + 1 UNTIL count > 5 → A loop that runs its body at least once before checking a condition
UNTIL count > 5 → Checks a condition after the loop body has run
A loop guaranteed to run its body at least once → REPEAT-UNTIL loop
The keyword that marks the start of the loop body → REPEAT
count ← 0 REPEAT DISPLAY count count ← count + 1 END UNTIL count = 3 → The loop should close with UNTIL and its condition, not END UNTIL
n ← 1 REPEAT DISPLAY n n = n + 1 UNTIL n > 5 → Assignment should use ←, not =

Key Term

REPEAT ... UNTIL condition
A loop that repeats its instructions and checks the condition after each repetition, so the body always runs at least once

Fill in the Blanks

1. REPEAT DISPLAY count
Hint: Type the keyword that starts a repeat-until loop
2. REPEAT DISPLAY count UNTIL count > 5
Hint: Type the keyword that introduces the condition checked after each repetition
3. UNTIL count > 5
Hint: Type the operator that checks if count is greater than 5
4. A REPEAT-UNTIL loop is a post-test loop
Hint: Type the word describing when the condition is checked, relative to the loop body
5. REPEAT-UNTIL loops always run at least once
Hint: Type the word for how many times the body is guaranteed to run

Spot the Error

Question 1
A count ← 1
B REPEAT
C DISPLAY count
D count ← count + 1
E END UNTIL count > 5
Line E — A REPEAT-UNTIL loop closes with UNTIL followed by the condition, not END UNTIL.
Question 2
A x ← 10
B REPEAT
C PRINT x
D x ← x - 1
E UNTIL x = 0
Line C — VCAA pseudocode uses DISPLAY to output a value, not PRINT.
Question 3
A total ← 0
B REPEAT
C total ← total + 10
D WHILE total < 100
Line D — A REPEAT loop must close with UNTIL and its condition, not WHILE.
Question 4
A n ← 1
B REPEAT
C DISPLAY n
D n = n + 1
E UNTIL n > 5
Line D — Assignment in pseudocode uses ←, not =.
Question 5
A i ← 1
B WHILE
C DISPLAY i
D i ← i + 1
E UNTIL i > 5
Line B — This loop closes with UNTIL, so it must start with REPEAT, not WHILE.

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