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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.〔(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.〕 ==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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ABC (programming language)」の詳細全文を読む スポンサード リンク
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