Reverse Polish Lisp
Reverse Polish Lisp, aka Reverse Polish Lisp, is a programming language created in 1984. RPL (derived from Reverse Polish Lisp according to its original developers, whilst for a short while in 1987 HP marketing attempted to coin the backronym ROM-based Procedural Language for it) is a handheld calculator operating system and application programming language used on Hewlett-Packard's scientific graphing RPN (Reverse Polish Notation) calculators of the HP 28, 48, 49 and 50 series, but it is also usable on non-RPN calculators, such as the 38, 39 and 40 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 stack-based, as well as the list-based LISP. Read more on Wikipedia...
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- Reverse Polish Lisp ranks in the top 10% of languages
- the Reverse Polish Lisp wikipedia page
- Reverse Polish Lisp first appeared in 1984
- See also: forth, lisp, assembly-language
- Have a question about Reverse Polish Lisp not answered here? Email me and let me know how I can help.
Example code from the Hello World Collection:
Hello World in RPL for the HP-28, HP-48, HP-49 and HP-50 series pocket calculators. No comments possible.
<<
"HELLO WORLD"
1 DISP
60 FREEZE
>>
Example code from Wikipedia:
«
0 @ Start with zero on the stack
1 10 @ Loop from 1 to 10
FOR I @ "I" is the local variable
I + @ Add "I" to the running total
NEXT @ Repeat...
»
Last updated February 18th, 2020