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APL - Just Solve the File Format Problem

APL

From Just Solve the File Format Problem
Revision as of 02:52, 14 December 2012 by Dan Tobias (Talk | contribs)

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File Format
Name APL
Ontology
Released 1960


APL, known best as "that programming language with all the weird symbols", was developed by Kenneth E. Iverson at IBM in 1960, based on a mathematical notation he had devised in 1957 and published in a book called A Programming Language, from which the language's name came.

APL is capable of expressing complicated mathematical expressions such as various forms of matrix manipulation in a concise notation which makes use of a number of specialized symbols. Since these symbols were not part of the usual character sets (such as ASCII and EBCDIC) in use around the time the language was developed (though they have since been added to Unicode and can hence be expressed in modern character encodings such as UTF-8), a specialized character set was used, often implemented as a separate type ball for IBM Selectric printing terminals. Special labels were often used on keyboards of terminals used for APL programming to show the characters the keys were associated with, which were different from the terminal's normal characters. Even in modern times, when the special characters are available as part of the Unicode set, actually typing them can be difficult without a specialized editor program designed for APL.

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