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.

Implementation

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

#include <stdio.h> int main() { unsigned long accumulator = 0; char c[1000]; for(int i=0;;i++) { scanf("%c",&c[i]); if(c[i]=='

') break; } for(int i=0;c[i]!='\0';i++) { if(c[i]=='H') printf("Hello, World!

"); else if(c[i]=='Q') printf("%.*s", (int)sizeof c, c); else if(c[i]=='9') { for(int i=99;i>0;i--) { printf("%d bottles of beer on the wall,

%d bottles of beer.

", i); printf("Take one down, pass it around,

%d bottles of beer on the wall.", i-1); } printf("1 bottle of beer on the wall,

1 bottle of beer.

Take one down, pass it around,

no more bottles of beer on the wall."); } else if(c[i]=='+') accumulator++; } return 0; }

Lanmonster fixed the Q instruction and added the + instruction

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.

BrainfisHQ9+ HQ9+, brainfuck and deadfish combined.