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HQ9+
{{wrongtitle|title=HQ9+}}

'''HQ9+''' is a [[joke programming language]] created by [[Cliff Biffle]] that consists of only four [[command (computing)|commands]], each represented by a single character: H, Q, 9, and +.  It is not [[Turing-complete]], but it is highly efficient at certain types of [[computer program|programs]].

* The H command prints out [[Hello world program|"Hello, world!"]]
* The Q command prints out a copy of the [[source code]] of the program (i.e., it's a [[quine]]).
* The 9 command prints out the lyrics for [[99 Bottles of Beer|99 Bottles of Beer on the Wall]].
* The + command increments the [[Accumulator (computing)|accumulator]].

An example '''HQ9+''' program would be:  "HHQ+HQ++"

This program would output "Hello, world!  Hello, world!  HHQ+HQ++  Hello, world!  HHQ+HQ++" as well as incrementing the [[accumulator]] three times.

It is claimed that all useful programs written in HQ9+ run over twice as fast as the same programs written in any other language. Since no useful programs can be written in HQ9+, this is [[vacuous truth|vacuously true]].

(contracted; show full)*[http://www.dangermouse.net/esoteric/hq9plusplus.html HQ9++]
*[http://www.dangermouse.net/esoteric/ DM's Esoteric Programming Languages]

[[Category:Esoteric programming languages]]

[[es:HQ9 más]]
[[ko:HQ9 플러스]]
[[it:Hq9plus]]