Edit: RPL

RPL is a structured programming language based on [[https://en.wikipedia.org/wiki/Reverse_Polish_notation|reverse Polish notation]](RPN), but equally capable of processing algebraic expressions and formulae, implemented as a [[https://en.wikipedia.org/wiki/Threaded_code|threaded interpreter]]. RPL has many similarities to [[Forth]], both languages being [[https://en.wikipedia.org/wiki/Stack-oriented_programming_language|stack-based]], as well as the list-based [[Lisp]]. Contrary to previous HP RPN calculators, which had a fixed four-level stack, the stack used by RPL is only limited by available calculator RAM. RPL (an acronym for '''Reverse Polish Lisp''') is the onboard calculator language for the HP-28 and [[wp:HP 48 series|HP 48]] lines of graphing calculators. It is a stack language (not a [[Lisp]]-like language, as its name implies), tightly integrated with the calculator system, with many instructions similar to Forth. It can natively handle unsigned integers (named ''binary integers''), floating-point numbers (named ''real numbers''), complex numbers, vectors and matrices (named ''arrays''), lists and algebraic expressions. There are actually two languages with the name RPL: '''User RPL''' and '''System RPL'''. System RPL is used in implementing the operating system, and User RPL is the language users use to write programs on the calculator. The language [[RPL/RPL2]] is a recreation of this language for POSIX machines. [[https://en.wikipedia.org/wiki/RPL_(programming_language)]]

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