Notes for B2.3.1 Constructing Programs That Implement the Correct Sequence of Code Instructions - IB | RevisionDojo
B2.3.1 Constructing Programs That Implement the Correct Sequence of Code Instructions Notes
The Impact of Instruction Order on Program Functionality
Why Instruction Order Matters
Programs must follow a logical flow of execution.
Incorrect order leads to logic errors, unexpected results, or runtime failures.
Analogy: In a recipe, you must mix ingredients before baking—same as initializing variables before using them.
Hint
Always check dependencies: what must happen first?
Common Mistake
Using variables before initialization → crashes or undefined results.
Avoiding Common Errors Through Proper SequencingInfinite Loops
Cause: Loop termination condition never met.
Example: Forgetting to increment a counter.
Solution: Carefully update conditions and variables.
Hint
Add print/debug statements inside loops to confirm progress.
Common Mistake
Writing while(true) without a proper break condition.
Strategies for Ensuring Correct Instruction Order
Algorithm Design
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Note
The Impact of Instruction Order on Program Functionality
Programs must follow a logical flow of execution.
Incorrect order leads to logic errors, unexpected results, or runtime failures.
Analogy: In a recipe, you must mix ingredients before baking—same as initializing variables before using them.
DefinitionInstruction Order
The specific sequence in which code statements are executed in a program.
Example
In a login system, you must check user credentials before granting access.
Common Mistake
Using variables before they are initialized.
Tip
Always check dependencies: what must happen first?
