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(Here you can see how popular each programming language in present times. ) It is difficult to determine which programming languages are most widely used, and what usage means varies by context. One language may occupy the greater number of programmer hours, a different one have more lines of code, a third may utilize the most CPU time, and so on. Some languages are very popular for particular kinds of applications. For example, COBOL is still strong in the corporate data center, often on large mainframes; Fortran in engineering applications; C in embedded applications and operating systems; and other languages are regularly used to write many different kinds of applications. ==Methods== Various methods of measuring language popularity, each subject to a different bias over what is measured, have been proposed: * counting the number of times the language name is mentioned in web searches, such as is done by Google Trends * counting the number of job advertisements that mention the language〔(【引用サイトリンク】url=http://jobstractor.com/monthly-stats )〕 * the number of books sold that teach or describe the language〔(State of the Computer Book Market 2008, part 4 — The Languages )〕 * estimates of the number of existing lines of code written in the language – which may underestimate languages not often found in public searches〔Bieman, J.M.; Murdock, V., Finding code on the World Wide Web: a preliminary investigation, Proceedings First IEEE International Workshop on Source Code Analysis and Manipulation, 2001〕 * counts of language references (i.e., to the name of the language) found using a web search engine〔(【引用サイトリンク】title=Tiobe Index Definition )〕 * counting the number of projects in that language on SourceForge〔(Programming Language Usage Graph ) by François Labelle ''"usage of top computer languages from Sept 2000 to Feb 2006 () at SourceForge."''〕 and FreshMeat〔Eric S. Raymond, The Art of Unix Programming, Chapter 14. Languages, http://www.catb.org/~esr/writings/taoup/html/ch14s05.html〕 *counting the number of postings in Usenet newsgroups about the language〔(How popular are various programming languages? ) by Anton Ertl TU Wien〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Measuring programming language popularity」の詳細全文を読む スポンサード リンク
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