Chief Differences From ALGOL 68
- no union
- no flex but strings are handled specially
- no arrays inside structures (but references to arrays would be allowed) and a similar restriction on arrays of arrays (multidimensional arrays are nonetheless permitted)
- limitations on use of long and short to facilitate implementation on small computers
- no heap
- no parallel processing
- restrictions on the order of declaration and other small syntactic differences to make single pass compilation possible
- no formats
(summarised from Appendix 4 of the Informal Introduction)
Read more about this topic: ALGOL 68S
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