ABC (programming language)
ABC is an imperative general-purpose programming language and programming environment developed at CWI, Netherlands by Leo Geurts, Lambert Meertens, and Steven Pemberton. It is interactive, structured, high-level, and intended to be used instead of BASIC, Pascal, or AWK. It is not meant to be a systems-programming language but is intended for teaching or prototyping.
The language had a major influence on the design of the Python programming language (as a counterexample); Guido van Rossum, who developed Python, previously worked for several years on the ABC system in the early 1980s.[2][3]
Features
Its designers claim that ABC programs are typically around a quarter the size of the equivalent Pascal or C programs, and more readable. Key features include:
- Only five basic data types.
- Does not require variable declarations.
- Explicit support for top-down programming.
- Statement nesting is indicated by indentation, via the off-side rule.
- Infinite precision arithmetic, unlimited-sized lists and strings, and other features supporting orthogonality and ease of use by novices.
ABC was originally a monolithic implementation, leading to an inability to adapt to new requirements, such as creating a graphical user interface. ABC could not directly access the underlying file system and operating system.
The full ABC system includes a programming environment with syntax-directed editing, suggestions, persistent variables, and multiple workspaces - and is available as an interpreter/compiler, currently at version 1.05.02, and ported to Unix, DOS, Atari, and Apple Macintosh.
Example
An example function to collect the set of all words in a document:
HOW TO RETURN words document:
PUT {} IN collection
FOR line IN document:
FOR word IN split line:
IF word not.in collection:
INSERT word IN collection
RETURN collection
Notes
- ^ "He was clearly influenced by ALGOL 68's philosophy of providing constructs that can be combined in many different ways to produce all sorts of different data structures or ways of structuring a program." - Guido van Rossum Federico Biancuzzi; Shane Warden (April 2009). Masterminds of Programming: Conversations with the Creators of Major Programming Languages. O'Reilly Media. p. 32. ISBN 0-596-51517-0. Retrieved December 14, 2009.
- ^ The A-Z of Programming Languages: Python. "...I figured I could design and implement a language 'almost, but not quite, entirely unlike' ABC, improving upon ABC's deficiencies...", Computerworld (2008-08-05). Retrieved on 2014-07-08.
- ^ An Interview with Guido van Rossum. "... in my head I had analyzed some of the reasons it had failed..." ONLamp.com. Retrieved on 2013-07-08.
References
This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.