Revision as of 19:49, 1 December 2006 edit Gwern (talk \| contribs) Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers 48,508 edits m Robot-assisted disambiguation (you can help!): Forth programming language ← Previous edit		Revision as of 22:38, 31 January 2007 edit undo Jason Marc (talk \| contribs) 6 edits added information about the dangers of using SysRPL carelessly, the slowdown in UserRPL programs, and SYSEVAL; FORTH to Forth; added more links; deleted "HP50" series (it's part of the 49 series) Next edit →
Line 1: The '''RPL programming language''' (RPL meaning '''[[Reverse Polish notation\|Reverse Polish]] [[Lisp programming language\|LISP]]''' or, alternatively, '''[[read-only memory\|ROM]]-based procedural language''') is a [[calculator\|handheld calculator]] system and application [[programming language]] used on [[Hewlett-Packard]]'s engineering graphing [[reverse Polish notation\|RPN]] calculators of the [[HP-28]], [[HP-48]], ~~[[HP-49]]~~ and [[HP-5049]] series. RPL is a [[structured programming]] language based on RPN but equally capable of processing [[infix notation\|algebraic]] expressions and formulae. RPL has many similarities to [[Forth (programming language)\|Forth]], both languages being [[stack-oriented programming language\|stack]]-based, and of course the list-based ~~LISP~~Lisp. Contrary to previous HP RPN calculators, which had a fixed four-level stack, the ~~RPL~~ stack used by RPL is only limited by available calculator [[random-access memory\|RAM]]. RPL originated from HP's [[Corvallis, Oregon]] development facility in [[1984]] as a replacement for the previous practice of implementing the [[operating systems]] of calculators in [[assembly language]]. [http://www.hpcalc.org/hp48/docs/programming/rplman.zip] According to a quote by Dr. William Wickes, one of the original RPL developers, "the development team never calls it anything but (the initials) RPL." [http://www.faqs.org/faqs/hp/hp48-faq/part2/] Line 7: ==Variants== ~~In the~~The internal low- to medium-level variant of RPL, called '''System RPL''' (or '''SysRPL''')~~, it~~ is used on some earlier HP calculators as well as the aforementioned ones, as part of their [[operating system]] implementation language. This variant of RPL is not accessible to the calculator user without the use of external tools. It is possible to cause a serious crash while coding in SysRPL, so caution must be used while using it. The high-level '''User RPL''' (or '''UserRPL''') version of the language is available on said graphing calculators for developing textual as well as graphical application programs. All UserRPL programs are internally represented as SysRPL programs, ~~using~~but use only a safe subset of the available SysRPL commands. The ~~Commands~~error ~~available~~checking inthat ~~the~~is ~~SysRPL~~a ~~variant~~part ~~don't~~of ~~contain~~UserRPL ~~the~~commands, ~~same~~however, ~~level~~makes ofUserRPL ~~error~~programs ~~checking~~noticeably asslower ~~those~~than ~~available~~equivalent inSysRPL programs. The UserRPL, ~~requiring~~command aSYSEVAL ~~greater~~tells ~~level~~the calculator to process designated parts of ~~care~~a ~~while~~UserRPL program as SysRPL ~~programming~~code. ==Control Blocks== Unlike ~~FORTH~~Forth, RPL control blocks are not strictly postfix. ~~The~~Although there are some notable exceptions, the control block structures appear as they would in a standard infix language. The calculator manages this by allowing the implementation of these blocks to skip ahead in the program stream as necessary. ===Conditional Statements=== Line 136: ==External links== [http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00554621/c00554621.pdf Advanced User's Reference Manual, command reference and RPL guide] – From ''HP'' [http://www.hpcalc.org/hp49/docs/programming/ RPL Programming Articles] – From ''hpcalc.org'' *[http://www.hpmuseum.org/rpl.htm Article on RPL, with code examples] – From ''The Museum of HP Calculators'' (MoHPC)

RPL (programming language): Difference between revisions