After some searching, I found this link for Pascal, which tells what I know about Pascal, that the value is undefined after leaving the loop. I think that Turbo Pascal and Borland Pascal had the value of the upper bound of the loop at the end of the loop, but confusion started once they implemented optimizations in BP7 and Delphi.
For C, I browsed the standard a bit, but didn't stumble on anything going in either direction, so I guess the behaviour is neither implementation defined nor undefined but merely unspecified (some FAQ goes to some lengths to explain the differences between these three regarding the ANSI C standard...). I guess that one will find ugly differences soon enough if one uses enough different compilers and not only gcc...
The same pages as for the Pascal link give some remarks about C loops, but also no hint as to what the value of the loop iterator is after leaving the loop.
perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ; # The
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' # web
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