Short Code (computer language): Difference between revisions

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{{Short description|Early higher-level language for electronic computers}}

{{about|the early computer language Short Code|the use of this term in connection with telecommunications|Short code}}

{{Infobox programming language

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| paradigm =

| released = {{Start date|1950}}

| developer = William F SchmidtSchmitt, A. B. Tonik, J. R. Logan

| influenced by = [[ENIAC Short Code]]

| influenced = [[Intermediate Programmingprogramming Languagelanguage]], [[OMNIBAC Symbolic Assembler]]

}}

'''Short Code''' was one of the first higher-level languages ever developed for an [[electronic computer]].<ref name=Sebesta>Sebesta, R. W.S Concepts of Programming languages. 2006; M6 14:18 pp. 44. {{ISBN |0-321-33025-0}}.</ref> Unlike [[machine code]], Short Code statements represented mathematic expressions rather than a machine instruction. Also known as automatic programming, the source code was not compiled but executed through an interpreter to simplify the programming process. The execution time was, naturally, much slower.<ref>Sebesta, R. W. Concepts of Programming languages. 11E; Chapter 2, pp. 39. {{ISBN|978-0133943023}}.</ref>

==History==

Short Code was proposed by [[John Mauchly]] in 1949 and originally known as [[Brief Code]]. William Schmitt implemented a version of Brief Code in 1949 for the [[BINAC]] computer, though it was never debugged and tested. The following year Schmitt implemented a new version of Brief Code for the [[UNIVAC &nbsp;I]], where it was now known as Short Code (also Short Order Code). A revised version of Short Code was developed in 1952 for the Univac &nbsp;II by A. &nbsp;B. Tonik and J. &nbsp;R. Logan.<ref>Schmitt, William F. The UNIVAC SHORT CODE. Annals of the History of Computing (1988) 10:pages 7-87–8.</ref>

While Short Code represented expressions, the representation itself was not direct and required a process of manual conversion. Elements of an expression were represented by two-character codes and then divided into 6-code groups in order to conform to the 12 -byte words used by BINAC and Univac computers.<ref>Schmitt, William F. The UNIVAC SHORT CODE. Annals of the History of Computing (1988) 10:page 15.</ref> For example, the expression:

<syntaxhighlight lang="c">

a = (b + c) / b * c

</syntaxhighlight>

was converted to Short Code by a sequence of substitutions and a final regrouping:

<syntaxhighlight lang="c">

X3 = ( X1 + Y1 ) / X1 * Y1 substitute variables

X3 03 09 X1 07 Y1 02 04 X1 Y1 substitute operators and parentheses.

Note Notethat multiplication is represented

represented by juxtaposition.</syntaxhighlight><syntaxhighlight lang="text">

07Y10204X1Y1 group into 12-byte words.

0000X30309X1

0000X30309X1p0p90p;o;op;op;

</syntaxhighlight>

Along with basic [[arithmetic]], Short Code allowed for branching and calls to a library of functions. The language was [[interpreter (computing)|interpreted]] and ran about 50 times slower than [[machine code]].<ref> Malik, Masud Ahmad. Evolution of the High Level Programming Languages: A Critical Perspective. ACM SIGPLAN Notices (December 1998) 33(12) page 74.</ref>

== See also ==

* [[History of programming languages]]

* [[algorithmAlgorithm]]

==References==

{{reflist}}

* Wexelblat, Richard L. (Ed.) (1981). <em>History of Programming Languages</em>, p. 9. New York: Academic Press. ISBN 0-12-745040-8

* Murdoch, Short Code (HOPL) [http://hopl.murdoch.edu.au/showlanguage.prx?exp=2707&language=SHORT%20CODE]

==External links==

*[http://www Wexelblat, Richard L.byte (Ed.com/art/9509/sec7/art19) (1981).htm A Brief ''History of Programming Languages]'', p.&nbsp;9. New York: Academic Press. {{ISBN|0-12-745040-8}}

* {{Cite web|url=http://hopl.info/showlanguage.prx?exp=2707&language=SHORT%20CODE|title=Short Code|last=|first=|date=|website=hopl.info|access-date=2018-05-20}}

*[http://www.uow.edu.au/~hasan/buss930/prog/prlangs1.htm A Brief History of Computing Languages]

*[http://hopl.murdoch.edu.au/findlanguages2.prx?id=us&which=ByCountry&ByYear=Yes The Encyclopedia of Computer Languages]

[[Category:Procedural programming languages]]

[[Category:Programming languages created in 1950]]

[[et:Short Code]]

[[ja:Short Code (プログラミング言語)]]

[[pt:Short Code]]

[[ru:Short Code]]