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HQ9+ is a joke language with four instructions:

Although the language is not of serious interest by itself, it can be useful to implement HQ9+ in a new esoteric programming language, since doing so proves that all the tasks above, except the quine, are possible. HQ9+ was created in 2001 by Cliff L. Biffle.


User:A was here and here is the implementation(in C):

#include <stdio.h>
int main()
    char c[1000];
    for(int i=0;;i++)
        if(c[i]=='\n') break;
    for(int i=0;c[i]!='\0';i++)
        if(c[i]=='H') printf("Hello World\n");
        else if(c[i]=='Q') printf("%s", c[]);
        else if(c[i]=='9')
                for(int i=99;i>0;i--)
                    printf("%d bottles of beer on the wall,\n%d bottles of beer.\n", i);
                    printf("Take one down, pass it around,\n%d bottles of beer on the wall.", i-1);
                printf("1 bottle of beer on the wall,\n1 bottle of beer.\nTake one down, pass it around,\nno more bottles of beer on the wall.");
    return 0;


See also

  • HQ9++, an object-oriented extension of HQ9+.
  • CHIQRSX9+, another HQ9+ extension supposedly Turing complete.
  • HQ9+B, an ℒ-complete extension of HQ9+.
  • HQ9+2D, a 2-D extension of HQ9+.
  • H9+, with one fewer instruction but still capable of all of the tasks.
  • FISHQ9+, HQ9+ and deadfish combined.
  • HI9+, which replaces Q with an instruction that prints the interpreter's source code.
  • +, where there is only +, and other characters are ignored.
  • Hq9eFuck, HQ9+, brainfuck and Deep Thought combined.

External resources