Yeah, but it's not like this is the first off-topic post and he marked as such. And there is a (very) loose tie-in to Perl. Why make a big deal out of it? If you do not want to answer it, then just ignore it. Heck, it was not even an approved node until I just approved it!
Update: It's not like we are getting tons of off-topic C questions. If we were, then it might be time to clamp down on it. But for one or two a year I am not seeing a problem. And since Perl is written in C, it is tangentially related, much like SQL and database questions are. And that's ignoring XS. Becoming better at C in general likely translates to writing better XS based modules later on, right? So how off-topic is it really? Not as off-topic as Java I'd wager.