ALGOL 68R: Difference between revisions
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{{wikipedia}}{{implementation|ALGOL 68}}
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ALGOL 68R from [[wp:Royal_Radar_Establishment|RRE]] was the first [[ALGOL 68]] subset implementation, running on the [[wp:ICL_1900|ICL 1900]].▼
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Based on the original language, the main subset restrictions were ''definition before use'' and no parallel processing.▼
▲'''ALGOL 68R''' from [[wp:Royal_Radar_Establishment|RRE]] was the first [[ALGOL 68]]
▲Based on a subset of the original language, the main
This compiler was popular in [[wp:United_Kingdom|UK]] universities in the 1970s, where many [[wp:computer_science|computer science]] students learnt [[ALGOL 68]] as their first programming language; the compiler was renowned for good error messages.
== Differences between Algol 68R and the Revised Report ==
Algol 68R was designed to implement a dialect of the language of the original report so there are many language differences compared to the revised report.
Some of the more visibly obvious include:
* Loops do not end with OD, the loop body (probably an encloaed clause) follows DO, e.g. TO 10 DO BEGIN something; something else END
* The CASE conformity clause (used to get values out of a UNION) is significantly different.
* ELSF is used instead of ELIF.
* OUSE (contraction of OUT CASE) is not available.
* The mode COMPL is spelt COMPLEX.
There are many other differences, not all of which are syntatic.
== Download ==
Details of how to run Algol 68R under a George 3 emulator can be found at the links below. The emulator and Algol 68R can be run on a number of systems, including the Raspberry Pi.
* http://sw.ccs.bcs.org/CCs/g3/index.html
* http://sw.ccs.bcs.org/CCs/g3/g3pi.htm
Note that this software is strictly for non-commercial use.
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