Unit 4 Simple Error Handling
Syntax, logic and runtime errors, defensive input handling, exception awareness, diagnostic evidence and recovery.
How to study for CCEA GCSE Digital Technology
Connect precise digital concepts to scenario evidence, design decisions, testing and evaluation, then rehearse the controlled-practice lifecycle under your centre's current CCEA instructions.
Core concepts
Concept 1
Syntax errors violate language rules, runtime errors occur during execution and logic errors produce an unintended result despite execution.
Exam cue: Classify an error from observed behaviour before proposing a correction.
Concept 2
Defensive design validates foreseeable input and provides clear recovery rather than allowing a preventable failure.
Exam cue: Handle only errors the program can respond to meaningfully.
Concept 3
Useful diagnosis isolates the smallest reproducible case and compares actual state or output with the expected result.
Exam cue: Retest the corrected path and a nearby valid path to check for regression.
Risk pitfalls and guardrails
Calling every incorrect result a syntax error.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Suppressing an error without restoring a valid program state.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Changing several unrelated statements before identifying the cause.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Memory anchors
Syntax error
Code that does not conform to the programming language grammar.
Runtime error
A failure that occurs while otherwise valid code executes.
Logic error
Executable code that produces an unintended result.
Defensive programming
Anticipating foreseeable invalid states and handling them safely.
Diagnostic evidence
Observed state, output or messages used to locate a fault.
Regression test
A repeat test confirming that a change has not broken existing behaviour.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
[Programming route] What is a syntax error?
What is a runtime error?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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