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Pascal
ISO 7185:1990
This online copy of the unextended Pascal standard is provided only as an aid to standardization. In the case of differences between this online version and the printed version, the printed version takes precedence.
Do not modify this document. Do not include this document in another software product. You may print this document for personal use only. Do not sell this document.
Use this information only for good; never for evil. Do not expose to fire. Do not operate heavy equipment after reading, may cause drowsiness. Do not read under the influence of alcohol (although there have been several unconfirmed reports that alcohol actually improves the readability). The standard is written in English. If you have trouble understanding a particular section, read it again and again and again... Sit up straight. Eat your vegatables. Do not mumble.
© ISO/IEC 1991
ISO/IEC 7185:1990(E)
Acknowledgements
The efforts are acknowledged of all those who contributed to the work of the BSI and ISO Pascal working groups, and in particular:
Tony Addyman Harris Hall John Reagan
Albrecht Biedl Carsten Hammer Mike Rees
Bob Brewer Atholl Hay Arthur Sale
Coen Bron Tony Hetherington Paula Schwartz
David Burnett-Hall Steve Hobbs Barry Smith
David Bustard Mel Jackson John Souter
Barry Byrne Scott Jameson Manfred Stadel
Klaus Daessler David Jones Bob Tennent
Richard De Morgan David Joslin Tom Turba
Norman Diamond Katsuhiko Kakehi Eiiti Wada
Bob Dietrich Olivier Lecarme Willem Wakker
Ken Edwards Jim Miner David Watt
Jacques Farr'e Wes Munsil Jim Welsh
Bill Findlay Bill Price Brian Wichmann
The efforts are acknowledged of all those who contributed to the work of JPC, and in particular:
Michael Alexander Steven Hobbs David L. Presberg
Jeffrey Allen Albert A. Hoffman William C. Price
Ed Barkmeyer Robert Hutchins Bruce Ravenal
W. Ashby Boaz Rosa C. Hwang David L. Reese
Jack Boudreaux Scott Jameson David C. Robbins
A. Winsor Brown David Jones Lynne Rosenthal
Jerry R. Brookshire Steen Jurs Tom Rudkin
Tomas M. Burger Mel Kanner Stephen C. Schwarm
David S. Cargo John Kaufmann Rick Shaw
Richard J. Cichelli Leslie Klein Carol Sledge
Joe Cointment Bruce Knobe Barry Smith
Roger Cox Dennis Kodimer Rudeen S. Smith
Jean Danver Ronald E. Kole Bill Stackhouse
Debra Deutsch Alan A. Kortesoja Marius Troost
Bob Dietrich Edward Krall Thomas N. Turba
Victor A. Folwarczny Robert Lange Prescott K. Turner
G. G. Gustafson Rainer McCown Howard Turtle
Thomas Giventer Jim Miner Robert Tuttle
Hellmut Golde Eugene N. Miya Richard C. Vile, Jr
David N. Gray Mark Molloy Larry B. Weber
Paul Gregory William Neuhauser David Weil
Michael Hagerty Dennis Nicholson Thomas R. Wilcox
Charles E. Haynes Mark Overgaard Thomas Wolfe
Christopher Henrich Ted C. Park Harvey Wohlwend
Steven Hiebert Donald D. Peckham Kenneth M. Zemrowski
Ruth Higgins David Peercy
Charles Hill Robert C. B. Poon
(The above list is of people acknowledged in ANSI/IEEE770X3.97-1983.)
ISO/IEC 7185:1990(E)
Introduction
This International Standard provides an unambiguous and machine independent definition of the programming language Pascal. Its purpose is to facilitate portability of Pascal programs for use on a wide variety of data processing systems.
Language history
The computer programming language Pascal was designed by Professor Niklaus Wirth to satisfy two principal aims
a) to make available a language suitable for teaching programming as a systematic discipline based on certain fundamental concepts clearly and naturally reflected by the language;
b) to define a language whose implementations could be both reliable and efficient on then- available computers.
However, it has become apparent that Pascal has attributes that go far beyond these original goals. It is now being increasingly used commercially in the writing of both system and application software. This International Standard is primarily a consequence of the growing commercial interest in Pascal and the need to promote the portability of Pascal programs between data processing systems.
In drafting this International Standard the continued stability of Pascal has been a prime objective. However, apart from changes to clarify the specification, two major changes have been introduced.
a) The syntax used to specify procedural and functional parameters has been changed to require the use of a procedure or function heading, as appropriate (see 6.6.3.1); this change was introduced to overcome a language insecurity.
b) A fifth kind of parameter, the conformant-array-parameter, has been introduced (see 6.6.3.7). With this kind of parameter, the required bounds of the index-type of an actual-parameter are not fixed, but are restricted to a specified range of values.
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