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Reserved Identifiers
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- Snippet from Wikipedia: Reserved word
In a programming language, a reserved word (sometimes known as a reserved identifier) is a word that cannot be used by a programmer as an identifier, such as the name of a variable, function, or label – it is "reserved from use". In brief, an identifier starts with a letter, which is followed by any sequence of letters and digits (in some languages underline '_' is treated as a letter!).
In an imperative programming language and in many object-oriented programming languages, apart from assignments and subroutine calls, keywords are often used to identify a particular statement, e.g. if, while, do, for, etc. Many languages treat keywords as reserved words, including Ada, C, C++, COBOL, Java, and Pascal. The number of reserved words varies widely from one language to another: C has about 30 while COBOL has about 400.
Note that a few languages do not have any reserved words. Fortran and PL/I identify keywords by context, while Algol 60 and Algol 68 generally use stropping to distinguish keywords from programmer-defined identifiers, e.g.
.ifor'ifor'if'is a keyword distinct from identifierif.Most programming languages have a standard library (or libraries), e.g. mathematical functions sin, cos, etc. The names provided by a library are not reserved, and can be redefined by a programmer if the library functionality is not required.
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Reserved Keywords: (Also called: Language Keywords, Reserved Keyword, Reserved Word, Keywords, Reserved Identifier, Reserved Identifiers) Ada Keywords, ALGOL 68 Keywords, Angular Keywords, Android Keywords, Apple iOS Keywords, ARM Assembly Keywords, Assembly Keywords, AWK Keywords, Bash Keywords, BASIC Keywords, C Keywords (https://en.cppreference.com/w/c/keyword), C Sharp Keywords | Keywords, dot NET Keywords | NET Keywords, C plus plus Keywords | C++ Keywords (https://en.cppreference.com/w/cpp/keyword), Clojure Keywords, COBOL Keywords, Dart Keywords, Delphi Keywords, Django Keywords, Elixir Keywords, Erlang Keywords, F Sharp Keywords, Fortran Keywords, Flask Keywords, Golang Keywords, Groovy Keywords, Haskell Keywords, Jakarta EE Keywords, Java Keywords, JavaScript Keywords, JCL Keywords, Julia Keywords, Kotlin Keywords, Lisp Keywords (Common Lisp Keywords), Lua Keywords, MATHLAB Keywords, Objective-C Keywords, OCaml Keywords, Pascal Keywords, Perl Keywords, PHP Keywords, PL/I Keywords, PowerShell Keywords, Python Keywords, Quarkus Keywords, R Language Keywords, React.js Keywords, Rexx Keywords, RPG Keywords, Ruby Keywords, Rust Keywords, Scala Keywords, Spring Keywords, SQL Keywords, Swift Keywords, Transact-SQL Keywords, TypeScript Keywords, Visual Basic Keywords, Vue.js Keywords, X86 Assembly Keywords, X86-64 Assembly Keywords. (navbar_reserved_keywords - see also navbar_cpp_keywords)
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