First, reproduce the bug by tracing the loop with a small example to show how the stale variable causes incorrect results. Then, identify the variable that should be reset and move its initialization inside the loop, ensuring each iteration starts with a clean state. Finally, verify the fix by re-tracing and testing edge cases to confirm correctness.
Pro tip: Demonstrate a systematic debugging process: use print statements or a debugger to observe variable states across iterations, and mention that you'd add a regression test to prevent similar bugs. This shows you not only fix the issue but also improve code quality.
Create a minimal example that triggers the bug and trace the variable's value across iterations to pinpoint where it should be reset.
Explain why the variable persists across iterations (e.g., declared outside the loop) and how that leads to incorrect accumulation or state leakage.
Move the variable's initialization inside the loop (or reset it at the start of each iteration) to ensure a clean state.
Re-run the example and additional test cases, checking that each iteration now starts fresh and the overall output is correct.
Suggest adding a unit test or code review practice to catch similar scope-related bugs in the future.
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