What's the best way to return a random line in a text file using C?

Posted by jeremy Ruten on Stack Overflow See other posts from Stack Overflow or by jeremy Ruten
Published on 2008-10-24T01:56:00Z Indexed on 2010/05/28 23:52 UTC
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What's the best way to return a random line in a text file using C? It has to use the standard I/O library (<stdio.h>) because it's for Nintendo DS homebrew.

Clarifications:

  • Using a header in the file to store the number of lines won't work for what I want to do.
  • I want it to be as random as possible (the best being if each line has an equal probability of being chosen as every other line.)
  • The file will never change while the program is being run. (It's the DS, so no multi-tasking.)

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