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{{Infobox programming language
'''Euclid''' is an imperative programming language for writing verifiable programs. It was designed by [[Butler Lampson]] and associates at the [[Xerox PARC]] lab in the mid 1970s. The implementation was led by [[Ric Holt]] at the [[University of Toronto]] and [[James Cordy]] was the principal programmer for the first implementation of the [[compiler]]. It was originally designed for the [[Motorola 6809]] microprocessor. It was considered innovative for the time; the compiler development team had a 2 million dollar budget over 2 years and was commissioned by the [[Defense Advanced Research Projects Agency]] of the [[United States Department of Defense|U.S. Department of Defense]] and the [[Department of National Defence (Canada)|Canadian Department of National Defence]]. It was used for a few years at [[I. P. Sharp Associates]], [[MITRE|MITRE Corporation]], [[SRI International]] and various other international institutes for research in systems programming and secure software systems.▼
| name = Euclid
| logo =
| paradigm = [[Multi-paradigm programming language|multi-paradigm]]: [[structured programming|structured]], [[Imperative programming|imperative]], [[Functional programming|functional]]
| year = 1970s
| designer = [[Butler Lampson]], [[Xerox PARC]]
| developer = [[Ric Holt]] and [[James Cordy]]
| latest_release_version = <!--X.Y.Z/{{release date|mf=yes|YYYY|MM|DD}}-->
| latest release date =
| typing = [[strong typing|strong]], [[static typing|static]]
| implementations =
| dialects =
| influenced_by = [[Pascal (programming language)|Pascal]]
| influenced = [[Mesa (programming language)|Mesa]], [[Concurrent Euclid (programming language)|Concurrent Euclid]], [[Turing (programming language)|Turing]]
| operating_system =
| license =
| website =
| file_ext =
}}
▲'''Euclid''' is an imperative programming language for writing [[Formal verification|verifiable]] programs.
Euclid is descended from the [[Pascal programming language]]. Functions in Euclid are closed scopes, may not have side effects, and must explicitly declare imports. Euclid also disallows [[GOTO|goto]]s, floating point numbers, global assignments, nested functions and aliases, and none of the actual parameters to a function can refer to the same thing. Euclid implements modules as types. Descendants of Euclid include the [[Mesa programming language]], the [[Concurrent Euclid programming language]] and the [[Turing programming language]].
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