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DEVI - Identifiers and Variables - Identifiers and Variables

Definitions

Identifier

Name for something to identify it.
Constants, operators and reserved words do not have identifiers. These are referred directly.

Variable

Value that can vary while user is running application.
Variable refers to actual location in memory in which the data is stored.
variable has a name (identifier) which the program uses rather than actual memory address.
Variable has a data type which describes the kind of data that can be stored in that memory address.
Variable has a value (actual data).

Syntax

Set of grammatical rules that define the programming language.
Programming lines that follow rules are said to follow proper syntax.
An error occurs if there is incorrect syntax.

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