Problem with Pro*C

Hi,
  I am a newbie to Pro*C.
 I am having problems with Pro*C. I am using varchar variables in a loop and fetching records into those variables from a cursor. I am writing these variables to a text file for archival purposes. In-spite of NULL terminating these varchar variables, I find that in subsequent retrievals the old value contained in the varchar variable mix up with the newly fetched ones. variablename.arr will have both the old and the new values mixed up. Is there something very important i am missing.

Balaji.S

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