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I impressed them, hence I got hired
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What all questions they asked?
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That would depend on how the process is using the file. Does the file remain open while the process is ran? If so, it would throw an error. If the process keeps opening and closing it, is it read, write, append? Read would throw an error, append and write would not throw an error. Less
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The process would core dump or hang.
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I used TDD approach and used simple design patterns to implement it.
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Typical run of the mill interview questions. Answered them honestly.