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Can this not be moved to HQ9%2B? That's how Wikipedia does +s in titles. --IslandHopper973 15:03, 20 Jan 2007 (UTC)

Apparently not, I just tested, both with + and with %2B. Wikipedia only started supporting + some time before January 5, 2006 and our site may have an older version of Mediawiki. In any case %2B is a feature of URLs, not article names, and currently Wikipedia does not allow %2B in article names. --Ørjan 11:15, 21 Jan 2007 (UTC)
OK. Thanks for clearing that up.--IslandHopper973 16:27, 22 Jan 2007 (UTC)

Proving all the tasks are possible

Surely the Q instruction does not require a quine in the language in which HQ9+ is implemented? Phantom Hoover 21:07, 18 December 2009 (UTC)

No, the interpreter can just print out the program currently being interpreted, without any self-reference. LegionMammal978 (talk) 14:32, 30 August 2015 (UTC)
"Implementing Q proves instead that a cat program is possible." – this isn't quite true, you can imagine a language that's only capable of implementing cat on strings that contain a Q (or even only on strings that contain exactly one Q). It would likely be very contrived, though, and a language that can implement HQ9+ is very likely to be able to implement cat unless it's very contrived. --ais523 10:04, 29 November 2021 (UTC)