Pascal (programming language): Difference between revisions

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===ISO/IEC 7185:1990 Pascal===

In 1983, the language was standardized in the international standard IEC/ISO 7185<ref>{{cite book|title=ISO/IEC 7185:1990 Pascal|url=http://www.pascal-central.com/docs/iso7185.pdf|access-date=16 September 2014|url-status=dead|archive-url=https://web.archive.org/web/20160127044422/http://pascal-central.com/docs/iso7185.pdf|archive-date=27 January 2016|accessdate=16 September 2014}}</ref> and several local country-specific standards, including the American ANSI/IEEE770X3.97-1983, and ISO 7185:1983. These two standards differed only in that the ISO standard included a "level 1" extension for conformant arrays (an array where the boundaries of the array are not known until run time), where ANSI did not allow for this extension to the original (Wirth version) language. In 1989, ISO 7185 was revised (ISO 7185:1990) to correct various errors and ambiguities found in the original document.

The ISO 7185 was stated to be a clarification of Wirth's 1974 language as detailed by the User Manual and Report [Jensen and Wirth], but was also notable for adding "Conformant Array Parameters" as a level 1 to the standard, level 0 being Pascal without conformant arrays. This addition was made at the request of [[C. A. R. Hoare]], and with the approval of Niklaus Wirth. The precipitating cause was that Hoare wanted to create a Pascal version of the [[NAG Numerical Libraries|(NAG) Numerical Algorithms Library]], which had originally been written in FORTRAN, and found that it was not possible to do so without an extension that would allow array parameters of varying size. Similar considerations motivated the inclusion in ISO 7185 of the facility to specify the parameter types of procedural and functional parameters.