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{{Use dmy dates|date=April 2019|cs1-dates=y}}
{{Use list-defined references|date=October 2023}}
{{Infobox programming language
| name = RPL
| logo =
| paradigm = [[Concatenative programming|Concatenative]] ([[stack-oriented programming language|stack-based]]),<ref name="Joy_2020"/> [[structured programming|structured]]
| year = 1984<!-- development start --> (1986<!-- first products using it -->)
| designer = [[Hewlett-Packard]]
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| file_ext =
}}
[[File:HP48G.jpg | thumb | 220x124px | right | HP 48G calculator, uses RPL ]]
'''RPL'''{{ref|rpl_acronym_note_1}} is a [[calculator|handheld calculator]] operating system and application [[programming language]] used on [[Hewlett-Packard]]'s scientific graphing [[Reverse Polish Notation|RPN]] (Reverse Polish Notation) calculators of the [[HP-28 series|HP 28]], [[HP 48 series|48]], [[HP 49 series|49]] and [[HP 50g|50]] series, but it is also usable on non-RPN calculators, such as the [[HP 38G|38]], [[HP 39/40 series|39 and 40]] series. Internally, it was also utilized by the [[HP-17B|17B]], [[HP-18C|18C]], [[HP-19B|19B]] and [[HP-27S|27S]].<ref name="RPLMAN"/>
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Postfix conditional testing may be accomplished by using the IFT ("if-then") and IFTE ("if-then-else") functions.
IFT and IFTE pop two or three commands off the stack, respectively. The topmost value is evaluated as a
The following example uses the IFT function to pop an object from the bottom of the stack and, if it is equal to 1, replaces it with "One":
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==References==
{{
<ref name="Joy_2020">{{cite web |url=https://www.hpmuseum.org/forum/showthread.php?mode=linear&tid=15509&pid=135732 |title=The Joy of Programming? |publisher=Museum of HP Calculators |date=2020 |archive-url=https://web.archive.org/web/20211203131528/https://www.hpmuseum.org/forum/showthread.php?mode=linear&tid=15509&pid=135732 |archive-date=2021-12-03}}</ref>
<ref name="HP_4">http://h41268.www4.hp.com/live/index_e.aspx?qid=20709&jumpid=va_r11363_us/en/any/tsg/pl_ot_ob_ds_pd/calculatoremulators_cc/dt{{dead link|date=April 2018 |bot=InternetArchiveBot|fix-attempted=yes}}</ref>
<ref name="HP_7">http://www.calculatrices-hp.com/index.php?page=emulateurs<!-- https://web.archive.org/web/20170917223308/http://www.calculatrices-hp.com/index.php?page=emulateurs --></ref>
<ref name="HP_5">{{cite web |url=http://www.hpmuseum.org/forum/thread-4405-post-39600.html |title=Emulator of HP 50g with #2.16 ROM}}</ref>
<ref name="HP_6">http://www.calculatrices-hp.com/uploads/emulateurs/HP50gVirtualCalculatorSetup_3_1_30.zip<!-- https://web.archive.org/web/20170917095533/http://www.calculatrices-hp.com/uploads/emulateurs/HP50gVirtualCalculatorSetup_3_1_30.zip --></ref>
<ref name="HPJ38">{{cite journal |title=Computation for Handheld Calculators |author-last=Patton |author-first=Charles M. |journal=[[Hewlett-Packard Journal]] |publisher=[[Hewlett-Packard Company]] |___location=Palo Alto, California, USA |date=August 1987 |volume=38 |issue=8 |pages=21–25 |url=http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1987-08.pdf |access-date=2015-09-12 |archive-date=2011-12-06 |archive-url=https://web.archive.org/web/20111206105511/http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1987-08.pdf |url-status=dead }}</ref>
<ref name="Wickes_1988">{{cite conference |title=RPL: A Mathematical<!-- also seen as: "Mathematics". Check actual publication's cover. --> Control Language |author-last=Wickes |author-first=William C. |editor-first=Lawrence P. |editor-last=Forsely |date=1988-10-01 |orig-date=14–18 June 1988 |conference=Proceedings of the 1988 Rochester Forth Conference: Programming Environments |volume=8 |publisher=Institute for Applied Forth Research, Inc., [[University of Rochester]] |___location=Rochester, New York, USA |isbn=978-0-91459308-9 |oclc=839704944 |url=https://dl.acm.org/doi/abs/10.5555/534949 |pages=27–32 |quote=Several existing operating systems and languages were considered, but none could meet all of the design objectives. A new system was therefore developed, which merges the threaded interpretation of [[Forth (programming language)|Forth]] with the functional approach of [[Lisp (programming language)|Lisp]]. The resulting operating system, known unofficially as RPL (for Reverse-Polish Lisp), made its first public appearance in June of 1986 in the [[HP-18C]] Business Consultant calculator.}} (NB. This title is often cited as "RPL: A Mathematics Control Language". An excerpt is available at: [https://web.archive.org/web/20230328115142/https://www.hpcalc.org/details/1743][https://web.archive.org/web/20220419184811/https://www.hpcalc.org/hp48/docs/programming/rplman.zip])</ref>
<ref name="Schoorl_2000">{{cite web |title=HP48 Frequently Asked Questions List |author-first=André |author-last=Schoorl |date=2000-04-04 |pages=69 <!-- date=2015 |editor-first=Eric |editor-last=Rechlin | --> |publisher=HP Calculator Archive |orig-date=1997 |url=http://www.hpcalc.org/hp48/docs/faq/48faq-pdf.zip |access-date=2015-09-12}}</ref>
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