HQ9+ is a joke programming language created by Cliff Biffle. It has only four commands and it isn’t Turing-complete.
There is only 4 commands, represented by next characters H: print "Hello, world!" Q: print the program's source code (a Quine) 9: print the lyrics to "99 Bottles of Beer" +: add one to the accumulator (the value of the accumulator cannot be accessed) Any other character is ignored. Ok. Let's write some program: HQ9 Result: Hello world! HQ9 HQ9+ is very simple, but allows you to do some things that are very difficult in other languages. For example, here is a program that creates three copies of itself on the screen: QQQ This produces: QQQ QQQ QQQ
And that’s all. There are a lot of interpreters for HQ9+. Below you can find one of them
Originally contributed by Alexey Nazaroff, and updated by 1 contributor(s).