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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.
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.
Keywords are predefined reserved words with special syntactic meaning. [2] The language has two types of keyword — contextual and reserved. The reserved keywords such as false or byte may only be used as keywords. The contextual keywords such as where or from are only treated as keywords in certain situations. [3]
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 ...
Rapira (Russian: Рапира, rapier) is an educational procedural programming language developed in the Soviet Union and implemented on the Agat computer, PDP-11 clones (Electronika, DVK, BK series), and Intel 8080 and Zilog Z80 clones (Korvet). It is interpreted with a dynamic type system and high level constructions.
Modula-2 is a structured, procedural programming language developed between 1977 and 1985/8 by Niklaus Wirth at ETH Zurich. It was created as the language for the operating system and application software of the Lilith personal workstation. [1] It was later used for programming outside the context of the Lilith.
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 " & ").