ALGOL X
ALGOL X was the code name given to the programming language which the Working Group 2.1 on ALGOL of the International Federation for Information Processing was to develop as a successor to ALGOL 60. It attempted to find a "short-term solution to existing difficulties".
According to de Morgan[1] "... the Algol 60 devotees had not been idle... they set out to eliminate the dreaded Remaining Trouble Spots. They called their Algol 60 'Modified'."
One ALGOL X compiler is known to have existed, it was written with the AED-0 system ("Automated Engineering Design", also referred to as"ALGOL Extended for Design") by Douglas T. Ross of MIT.[2]
Example class definition: (An extract from AB26.2.2)
class expression is constant (real value) ora variable (string printname)
ora class pair is (sum ora difference ora product
ora quotient)((expression) left operand, right operand, derivative);
Example class usage:
(expression) X; (constant) Y; (pair) Z; (product) Q; X := Y:= constant(10.5); Z := Q := product(variable("ALPHA"), constant(2.), constant(2.))
"Initially the proposal for an update to Algol was Algol X, with Algol Y being the name reserved for the corresponding metalanguage. Van Wijngaarden produced a paper for the 1963 IFIP programming language committee, entitled “Generalized Algol,” which contained the basic concepts which were eventually incorporated into Algol 68."
The ALGOL Bulletin on ALGOL X
- AB21.3.1 - G. Seegmuller: Some proposals for ALGOL X
- AB21.3.2 - Joachim von Peschke: Proposals for ALGOL X
- AB22.3.2 - J.N. Merner: Own concept and ALGOL X
- AB22.3.10 - M. Woodger: ALGOL X, Note on the proposed successor to ALGOL 60
- AB25.0.1 - ALGOL Bulletin - ALGOL X
- AB26.2.2 - Douglas T. Ross: Features essential for a workable ALGOL X
References
- ↑ Algol Bulletin 41, Jul 1977, The Algollers
- ↑ Douglas T. Ross, October 1966 AN ALGORITHMIC THEORY OF LANGUAGE (AB26.2.2 page 6)
External links
- Investigations in CAD FR035 Chapter IV- AED beyond Algol 60 http://dspace.mit.edu/bitstream/handle/1721.1/755/FR-0351-19563962.pdf?sequence=1