Make the idea your own
- 1Read the highlighted pair before advancing.
- 2Predict whether it needs a swap, then Step.
- 3Run the trace to the end and check ascending order.
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Class 9 · Computing
Step through bubble sort
Interactive explanation Gamified quiz, feedback & rewards
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Suggested-level exploration · Learning goals & preparation
By the end, you can…
- Explain Compare neighbours → swap if left > right
- Change one input at a time and predict its effect before checking the model.
- Apply the relationship in a quiz and explain the reasoning behind your answer.
Useful preparation: Whole numbers, basic arithmetic and following ordered instructions.
This topic has a suggested learning level. A matching chapter in the current NCERT edition has not been verified, so it is not labelled as syllabus coverage.
Hands-on explainer · Class 9
Step through bubble sort
Class 9
CLASS 9 · CONCEPT QUEST
Turn understanding into a small adventureStep through bubble sort
Discover the rule, predict what happens, then solve a hands-on mission.
DiscoverFind the idea→PredictThink it through→BuildMake it click
3 rounds · no timer · up to 100 XP for your best result
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The relationshipCompare neighbours → swap if left > right
Be the bubble-sort algorithm
Only swap adjacent values that are out of order. After a complete left-to-right pass, a largest value reaches the right.
0 swaps · Keyboard: Tab to a bar, Enter to select, then select its neighbour.
Select two neighbouring bars, or drag one onto its neighbour.
Practice freely here. Your quiz stars are earned in the concept quest.
Explain the experiment
When the goal is met: Every adjacent comparison preserves the values and moves an out-of-order pair towards ascending order.