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ALGOL 68 Genie: Difference between revisions
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[[ALGOL 68G]] is an interpretor that runs on Linux and a good way to get started with [[ALGOL 68]]. ''ALGOL 68G'' mk14.1 is now available for download for Fedora9 from Source Forge - [http://sourceforge.net/project/showfiles.php?group_id=114223&package_id=300114&release_id=642308 Download now]. (This download RPM includes a 400 page [[ALGOL 68]] manual in printer ready pdf)
==Features of Algol68G==
* The [[interpreter]] performs checks on many events, for example: assigning to <
* Precision of numeric modes: implementation of <
* On systems that support them, UNIX extensions that allow e.g. for executing child processes that communicate through pipes, matching regular expressions or fetching web page contents.
* Procedures for drawing using the GNU Plotting Utilities.
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* Implementation of C.H. Lindsey's partial parametrisation proposal, which allows for currying in Algol 68, giving it a functional sublanguage.
* A simple refinement preprocessor to facilitate top-down program construction.
* Implementation of pseudo-operators <
* Implementation of a post-checked loop. A do-part may enclose a serial clause followed by an optional until-part, or just enclose an until-part. This is an alternative to the paradigm Algol 68 post-check loop <
* Implementation of <
== Deviations from the Revised Report language ==
The important deviations are:
* The important difference with the Revised Report transput model is that Algol68G transput does not operate on <
* The Algol68G parallel clause deviates from the Algol 68 parallel clause when parallel clauses are nested. In Algol68G, stack frames inside a parallel unit are private, therefore if parallel units modify a shared variable then this variable must be declared outside the outermost parallel clause, and a jump out of a parallel unit can only be targeted at a label outside the outermost parallel clause.
* The interpreter does not implement so-called ghost-elements {RR 2.1.3.4}, hence it cannot check bounds when assigning to rows of mode flexible-rows-of-rows-of-... when the destination has a flat descriptor.
* Algol68G does not recognise nonlocal environs {RR 5.2.3.2}. All environs are local.
* Transputting a file is essentially sequential. Only <
* When all arguments in a call of <
==See also==
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