ALGOL 68S

ALGOL 68S is a programming language designed as a subset of ALGOL 68, to allow compiling via a one-pass compiler.^[1] It was mostly for numerical analysis.

Implementations[]

A compiler for ALGOL 68S was available for the PDP-11, written in the language BLISS. The multiprocessor version designed for the C.mmp^[2] has been preserved at the PDP Unix Preservation Society archive.^[3]

Charles H. Lindsey created another implementation of ALGOL 68, named ALGOL 68S, for Sun-3, Sun SPARC (under SunOS 4.1), Sun SPARC (under Solaris 2), Atari ST (under GEMDOS) and Acorn Archimedes (under RISC OS), c.f. [2]

Chief differences from ALGOL 68[]

The main differences between ALGOL 68 and 68S, as summarised from Appendix 4 of the Informal Introduction,^[4] include:

• No union
• No flex, but strings are handled specially
• No arrays inside structures (but references to arrays were allowed) and a similar restriction on arrays of arrays (multidimensional arrays are nonetheless permitted)
• Limits on use of long and short to aid implementing on small computers
• No heap
• No parallel processing
• Limits on the order of declaration and other small syntactic differences to allow one-pass compiling
• No formats

References[]

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