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ABC 基本知识,英语字母表;火车时刻表 基本知识,英语字母表;火车时刻表 ABC n 1: the elementary stages of any subject (usually plural); "he mastered only the rudiments of geometry" [synonym: {rudiment}, {first rudiment}, {first principle}, {alphabet}, {ABC}, {ABC's}, {ABCs}] 1. 2. environment from {CWI}, Netherlands. It is interactive, structured, high-level, and easy to learn and use. It is a general-purpose language which you might use instead of {BASIC}, {Pascal} or {AWK}. It is not a systems-programming language but is good for teaching or prototyping. ABC has only five data types that can easily be combined; {strong typing}, yet without declarations; data limited only by memory; refinements to support top-down programming; nesting by indentation. Programs are typically around a quarter the size of the equivalent {Pascal} or {C} program, and more readable. ABC includes a programming environment with {syntax-directed} editing, {suggestions}, {persistent variables} and multiple workspaces and {infinite precision} arithmetic. An example function words 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 {Interpreter}/{compiler}, version 1.04.01, by Leo Geurts, Lambert Meertens, Steven Pemberton ABC has been ported to {Unix}, {MS-DOS}, {Atari}, {Macintosh}. {(http://cwi.nl/cwi/projects/abc.html)}. {FTP eu.net (ftp://ftp.eu.net/programming/languages/abc)}, {FTP nluug.nl (ftp://ftp.nluug.nl/programming/languages/abc)}, {FTP uunet (ftp://ftp.uu.net/languages/abc)}. Mailing list: E-mail: ["The ABC Programmer's Handbook" by Leo Geurts, Lambert Meertens and Steven Pemberton, published by Prentice-Hall (ISBN 0-13-000027-2)]. ["An Alternative Simple Language and Environment for PCs" by Steven Pemberton, IEEE Software, Vol. 4, No. 1, January 1987, pp. 56-64.] (1995-02-09) 2. An {abstract machine} for implementation of {functional languages} and its intermediate code. [P. Koopman, "Functional Programs as Executable Specifications", 1990]. (1995-02-09) Atanasoff-Berry-Computer Abc
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