Plus (programming language)
| Plus | |
|---|---|
| Paradigm | imperative, structured |
| Developer | Alan Ballard and Paul Whaley at UBC |
| Typing discipline | static, strong, safe |
| OS | Michigan Terminal System (MTS) |
| Major implementations | |
| IBM System/370 | |
| Influenced by | |
| SUE, Pascal | |
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Plus is a "Pascal-like" system implementation language from the University of British Columbia (UBC) based on the SUE[1] system language developed at the University of Toronto, circa 1971.
Description
Plus was developed at the University of British Columbia (UBC) Computing Centre by Alan Ballard and Paul Whaley for use with and for the development of the Michigan Terminal System (MTS).
Plus is based to a large extent on the SUE System Language[2] developed at the University of Toronto, circa 1971. The SUE language was derived, particularly in its data structure facilities from Pascal[3].
Plus is superficially quite different from SUE or Pascal; however the underlying language semantics are really quite similar. Users familiar with the C programming language will also recognize much of its structure and semantics in PLUS.
The 125 page manual, UBC PLUS, the Plus programming language, was available in the MTS file PLUS:MANUAL. The MTS file PLUS:LIBRARY.DOC contained a 120 page description of the source and object libraries available for use with Plus. The MTS file PLUS:NEWS contained updates to Plus and the Plus environment. These files are no longer readily available, but there is work underway to make a PDF file of the Plus Manual available via a web archive.
"Hello, world" example
The "hello, world" example program prints the string "Hello, world!" to a terminal or screen display.
%Title := "Hello world";
%Include(Pluslist);
%Subtitle := "Definitions";
%Lower_Case := True;
/* Definitions that everyone needs */
%Include(Boolean, Numeric_Types, More_Numeric_Types, String_Types,
More_String_Types);
/* A tasteful subset of procedure definitions */
%Include(Main);
/* Message routine definitions */
%Include(Message_Initialize, Message, Message_Terminate);
%Subtitle := "Local Procedure Definitions";
%Eject();
definition Main
variable Mcb is pointer to Stream_Type;
Mcb := Message_Initialize();
Message("Hello, world!");
Message_Terminate(Mcb);
Mcb := Null;
end Main;
See also
![[icon]](/wiki/File:Wiki_letter_w_cropped.svg?lang=en){kind=small} | This section needs expansion. You can help by adding to it. (June 2010) |
- Michigan Terminal System (MTS)
External Links
| This section needs expansion. You can help by adding to it. (June 2010) |
- The System Language for Project SUE, B. L. Clark and J. J. Horning, Computer Systems Research Group and Department of Computer Science, University of Toronto, in Proceedings of the SIGPLAN symposium on Languages for system implementation, 1971, pp. 79-88
References
- ^ The System Language for Project SUE, B. L. Clark and J. J. Horning of the Computer Systems Research Group and Department of Computer Science, University of Toronto, Proceedings of the SIGPLAN symposium on Languages for system implementation, 1971, pages 79-88
- ^ The System Language for Project SUE, B. L. Clark and J. J. Horning of the Computer Systems Research Group and Department of Computer Science, University of Toronto, Proceedings of the SIGPLAN symposium on Languages for system implementation, 1971, pages 79-88
- ^ MTS Volume 2: Public file Descriptions, University of Michigan Computing Center, Ann Arbor, Michigan, 1984, pp. 350.1, 350.2
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