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Chapter 3 Control Methods
Chapter 3 Control Methods

... matches the value of the switchexpression. Note that value1, ..., and valueN are constant expressions, meaning that they cannot contain variables in the expression, such as 1 + x. ...
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Reserved word

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 ALGOL and PL/I there are keywords but no reserved words, with keywords being distinguished from identifiers by other means.
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