Keyword (computer programming) | Wikipedia audio article
Channel: wikipedia tts
Date: 13/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Reserved_word


00:01:55 1 Distinction
00:03:14 2 Syntax
00:04:14 3 Reserved ranges
00:04:53 4 Specification
00:07:33 5 Predefined names
00:09:02 6 Definition
00:13:33 7 Comparison by language
00:15:14 8 Disadvantages
00:19:49 9 Reserved words and language independence
00:21:30 10 See also
00:22:21 11 References
00:24:01 12 External links



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SUMMARY
=======
In a computer language, a reserved word (also known as a reserved identifier) is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use". This is a syntactic definition, and a reserved word may have no meaning.
A closely related and often conflated notion is a keyword, which is a word with special meaning in a particular context. This is a semantic definition. By contrast, names in a standard library but not built into the language are not considered reserved words or keywords. The terms "reserved word" and "keyword" are often used interchangeably – one may say that a reserved word is "reserved for use as a keyword" – and formal use varies from language to language; for this article we distinguish as above.
In general reserved words and keywords need not coincide, but in most modern languages keywords are a subset of reserved words, as this makes parsing easier, since keywords cannot be confused with identifiers. In some languages, like C or Python, reserved words and keywords coincide, while in other languages, like Java, all keywords are reserved words, but some reserved words are not keywords – these are "reserved for future use". In yet other languages, such as the older languages ALGOL, FORTRAN and PL/I, there are keywords but no reserved words, with keywords being distinguished from identifiers by other means. This makes parsing more difficult with look-ahead parsers necessary.