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===Programming language===
If the interviewing position has specific [[programming language]] requirements, the candidate is expected to know those languages and solve the questions with it. If the interview is for general programming or development position, a thorough knowledge of one mainstream language such as [[C (programming language)|C]], [[C++]], [[C Sharp (programming language)|C#]], or [[Java (programming language)|Java]] may be enough to get by.{{Citation needed|date=February 2011}} An interviewer may also allow use of other popular languages, such as [[JavaScript]], [[PHP]], or [[Perl]].
====Manhole cover question====
[[File:Open Manhole and Cover Mid-City New Orleans.jpg|thumb|A round manhole and its cover]]
The question of why [[manhole covers]] are typically round (in some countries) was made famous by [[Microsoft]] when they began asking it as a job-interview question.<ref name="Microsoft Puzzle Book">{{cite book| last = Poundstone| first = William| title = How Would You Move Mount Fuji? Microsoft's Cult of the Puzzle – How the World's Smartest Company Selects the Most Creative Thinkers| publisher = Little, Brown| year = 2003| isbn = 0-316-91916-0| url = https://archive.org/details/howwouldyoumovem00poun}}</ref><ref>{{cite web|last=Davis |first=Jim |url=http://www.joblossguide.com/2009/02/why-are-manhole-covers-round_10.html |title=Why Are Manhole Covers Round? |publisher=Joblossguide.com |date=2009-02-10 |accessdate=2011-04-08 |url-status=dead |archiveurl=https://web.archive.org/web/20110612064454/http://www.joblossguide.com/2009/02/why-are-manhole-covers-round_10.html |archivedate=June 12, 2011 |df=mdy }}</ref> Originally meant as a psychological assessment of how one approaches a question with more than one correct answer, the problem has produced a number of alternative explanations, from the [[tautology (rhetoric)|tautological]] ("Manhole covers are round because manholes are round.")<ref name="Microsoft Puzzle Book" /> to the philosophical.
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