For the compiled database programming language, see Realtime Programming Language.
Paradigm(s) stack, structured
Appeared in 1984
Designed by Hewlett-Packard
Dialects System RPL, User RPL
Influenced by Forth, infix notation
OS HP calculators
The RPL programming language (RPL meaning ROM-based procedural language following Hewlett-Packard or, alternatively, Reverse Polish LISP) is a handheld calculator system and application programming language used on Hewlett-Packard's engineering graphing RPN calculators of the HP-28, HP-48, HP-49 and HP-50 series, but it is also usable on non-RPN calculators, such as the HP-39 series.
RPL is a structured programming language based on RPN but equally capable of processing algebraic expressions and formulae, implemented as a threaded interpreter. RPL has many similarities to Forth, both languages being sta
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