Report on the algorithmic language ALGOL 60
Communications of the ACM
The implementation of a BASIC system in a multiprogramming environment
Communications of the ACM
Some techniques used in the ALCOR ILLINOIS 7090
Communications of the ACM
On the structure of dictionaries for compilers
ACM SIGPLAN Notices
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A syntax checker was designed based on the syntax of ALGOL as described in the ALGOL 60 Report [Communications of the ACM, May 1960]. Since the definition of the elements of the language is recursive it seemed most desirable to design the syntax checker as a set of mutually recursive processors tied together by subroutines which perform certain bookkeeping functions. Because of the recursive nature of the language and of the syntax checker the problem of recovery after an error required much attention. A method was devised which permits most programs to be checked completely despite errors.