(Usually) Not at all (based on a very limited sample). In fact, the interviewer is probably happier that you saved him some time, as they don't have to transfer code from the whiteboard to the feedback...
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I've never had a candidate do that, but I don't see why an interviewer would have a problem with it. It might even be somewhat nice in that is saves the interviewer time of copying your code.
- Gayle L McDowell March 06, 2013