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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".
ALGOL 60 (short for Algorithmic Language 1960) is a member of the ALGOL family of computer programming languages.It followed on from ALGOL 58 which had introduced code blocks and the begin and end pairs for delimiting them, representing a key advance in the rise of structured programming.
It supports multiple programming paradigms, including structured, object-oriented programming, and functional programming, and boasts a dynamic type system and automatic memory management. Python's syntax is simple and consistent, adhering to the principle that "There should be one— and preferably only one —obvious way to do it."
Modula-3 is a programming language conceived as a successor to an upgraded version of Modula-2 known as Modula-2+. It has been influential in research circles (influencing the designs of languages such as Java , C# , Python [ 8 ] and Nim ), but it has not been adopted widely in industry.
In languages derived from the original Smalltalk-80 the current activation of a method is accessible as an object named via a pseudo-variable (one of the six reserved words), thisContext, which corresponds to a stack frame in conventional language implementations, and is called a "context". Sending a message is done within some context, and to ...
Certain names are reserved as part of the programming language and can not be used as programmer-defined names. The majority of the most popular programming languages use reserved keywords. Early examples include FLOW-MATIC (1953) and COBOL (1959). Since 1970 other examples include Ada, C, C++, Java, and Pascal.
ALGOL 68 (short for Algorithmic Language 1968) is an imperative programming language that was conceived as a successor to the ALGOL 60 programming language, designed with the goal of a much wider scope of application and more rigorously defined syntax and semantics.
Larry Wall adopted shell scripting's use of sigils for his Perl programming language. [ citation needed ] In Perl, the sigils do not specify fine-grained data types like strings and integers, but the more general categories of scalars (using a prefixed " $ "), arrays (using " @ "), hashes (using " % "), and subroutines (using " & ").