Report on the algorithmic language Algol 68

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John, born August 14, in Pietermaritzburg, South Africa, passed away peacefully with his family by his side on November 6, He was a key member of the international community that pioneered the field of Computer Science beginning in the early 60s.

Revised Report on the Algorithmic Language Algol 68

He was an avid outdoorsman who enjoyed alpine climbing, skiing and cycle touring. He also had a strong love of music playing pipe organ, piano and classical recorder. He enjoyed a full and rich life and will be greatly missed. In lieu of flowers, please consider making a donation to the charity of your choice.

The Making of Algol 68 - Semantic Scholar

Condolences may be offered at www. Peck joined the ALGOL 68 design project in , was a coauthor of the report, edited the proceedings of the Munich implementation conference, hosted meetings that laid the foundations for the revised report, and chaired IFIP Working Group 2. That led to some valuable additions:. Several years ago I began an archival collection for the Algol family of programming languages: Algol 58 originally known as the International Algorithmic Language , Algol 60, and Algol I began looking for implementations of Algol 58 and Algol Lindsey and copyright holder IFIP.

In addition to the above-mentioned, a number of other people have contributed to the overall Algol archive project. As the ALGOL programming language enters its sixth decade, its interest to historians seems to be increasing.

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He also makes a few remarks about Algol Computer scientists, by contrast, have yet to commence with similar work concerning the ideas of their fathers: Dijkstra, McCarthy, Hoare and others. This, in turn, explains my motivation to write this paper. Daylight is off to a good start.

In that spirit, I offer the following photograph, taken at the Marktoberdorf Summer School, of instructor Dijkstra and student McJones. In a fascinating technical report , Gordon Bell describes this long and interesting history, in which he and his wife Dr. Gwen Bell have played such important roles. Others have assembled extensive collections on, for example, the Multics and Unix operating systems, PDP systems and applications , and many more.

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Two of the earliest relational database management systems, Berkeley Ingres and IBM System R, have been preserved but are not yet easily accessible. For the most part, these collections are aimed at a more scholarly audience; I hope they will serve as source materials for future exhibits for a wider audience. At about this time, a project began to develop a new language, Lisp 2, that would extend Lisp to include ALGOL -like syntax, type-checking, and numeric, string, and array data types. Before the Lisp 2 project began, an innovative compiler-only implementation of Lisp 1. Additional memos will be soon be available via the Stoyan collection. A universal algorithmic language. It was developed during — by a team of scientists from 12 countries, in the framework of the working group on Algol of the International Federation for Information Processing, for the exchange of algorithms, their effective realization by various computers, and as a means of their study.

While similar in style to Algol, Algol differs substantially from it in having many more constructions, which are also of a more general nature. The basic data types, in addition to the Algol "real" , "integer" and "Boolean" , are "character" for alpha-numeric information , "format" to describe the format of the external data , names and routines procedures. Thus, names and procedures can be "computed" when a program is executed in Algol, even though such a computation is limited by the necessity of selecting the value of, for example, a procedure out of a given finite population of "routine texts".

The basic types may be used to construct new, composite types by induction; these types may be homogeneous indexable sequences of data of the same type multiple values , or else ordered lists of data of arbitrary type structured values.

Computing Conversations: Niklaus Wirth

In addition to the conventional approach for defining procedures, Algol contains means for defining so-called infix operators of the type. The presence of a priority definition makes it possible to establish priority relations between the infix operators introduced. The identity definition, which is typical of Algol, is a general construction for defining variables, for assigning initial values, for the transmission of actual parameters in procedures and for creating synonyms.

An expression in Algol may contain an assignment statement, or any sequence of statements that produces a value. Together with the possibility of computing names and procedures, and also by the introduction of parenthesis pairs for conditional expressions, this permits Algol constructions such as illustrated by the following example:.

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An Algol program consists of closed, serial, conditional and collateral clauses. The first three types of clauses generalize such Algol concepts as block, compound statement and conditional expression and statement.

An expression-oriented, block-structured, procedural language

Collateral clauses signify non-ordered sets of component phrases and are used, in particular, to indicate parallel branches in the course of execution of the program. The description of the semantics of Algol is characterized by a profound analysis of the principal concepts of algorithmic languages, which makes it possible to give a description of the execution of a program using of a small number of independent fundamental concepts. The objects may be external with respect to the structure of the program and internal data, including procedures and names. The relations between external E and internal.

The execution of a program is described in terms of the relations thus introduced as a function of the analysis of the program. A typical syntactic feature of Algol is that it is given in the form of a two-level grammar, in which the Algol production rules are themselves well-formed texts in some meta-language, defined by its own generating grammar.