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Trace initialization, condition and update in a for loop; practise counters, nested loops and off-by-one checks.
Traverse values without unnecessary copies and recognize operations that invalidate iterators or references.
Compare entry-tested while and exit-tested do-while loops; use break and continue with explicit termination rules.
Distinguish formatted extraction from line input and handle stream failure without an endless retry loop.
Combine input, validation, transformation, and reporting without mixing every responsibility in one loop.
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