Thank you very much for your suggestions ikegami. The first one (!eof(DATFILE) solved my problem. I'll read up on while to understand why !eof changes the behaviour of while. After all I came here to seek wisdom and the journey to the solution often teaches you more than the solution itself. Thanks for pointing the direction I in which I have to travel. I'll also look into your other solutions and use that to make my code better. Sincerely, Hans

In reply to Re^2: while behaviour on binary files by Anonymous Monk
in thread while behaviour on binary files by Anonymous Monk

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