Karel (programming language): Difference between revisions

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|name = Karel the Robot

|logo =

|screenshot = [[File:NikiExample.jpg|220px]]

|screenshot size = 250px

|paradigm = [[procedural programming|procedural]]

|year = 1981

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==Principles==

A [[computer program|program]] in Karel is used to control a simple [[robot]] named selami Karel that lives in an environment consisting of a grid of streets (left-right) and avenues (up-down). Karel understands five basic instructions: <code>move</code> (Karel moves by one square in the direction he is facing), <code>turnLeft</code> (Karel turns 90&nbsp;° left), <code>putBeeper</code> (Karel puts a beeper on the square he is standing at), <code>pickBeeper</code> (Karel lifts a beeper off the square he is standing at), and <code>turnoff</code> (Karel switches himself off, the program ends). Karel can also perform [[boolean data type|boolean]] queries about his immediate environment, asking whether there is a beeper where he is standing, whether there are barriers next to him, and about the direction he is facing. A [[programmer]] can create additional [[instruction (computer science)|instruction]]s by defining them in terms of the five basic instructions, and by using conditional [[control flow]] statements <code>if</code> and <code>while</code> with environment queries, and by using the <code>iterate</code> construct.{{Citation needed|date=April 2020}}

===Example===

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* [http://xkarel.sourceforge.net xKarel] by R. Dostal and P. Abrahamczik (created 1997)

* [http://karel.sourceforge.net Karel] by T. Mitchell (created 2000)

* [http://primepuzzle.com/karel/ Karel in tiny-c] {{Webarchive|url=https://web.archive.org/web/20191128164514/http://primepuzzle.com/karel/ |date=2019-11-28 }} by Lee Bradley (created 2013)

* [http://karel.cloudmakers.eu Karel for iPad] by CloudMakers (created 2014)

* [http://www.codehs.com Karel in JavaScript] by CodeHS

* [https://metacpan.org/pod/Karel Karel in Perl 5] by E. Choroba (created 2016)

* [https://sourceforge.net/projects/karel-3d/ Karel-3D in JavaScript and C++ (sk) (en) (de) (es)] (created 2017, 2018)

* [httphttps://gvr.sourceforge.net/ Guido van Robot (GvR) - Karel in Python] (created 2006, 2010)

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