Introduction HQ9++ is an object-oriented extension of the well-known esoteric language HQ9+, created by Cliff L. Biffle. Design Principles Extend the elegance, simplicity, and power of HQ9+ to the object-oriented paradigm. Be backwards compatible with HQ9+. That is, any valid HQ9+ program will also run in HQ9++ and will produce identical output. Language Concepts HQ9+ was created to make some very