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Variable Definition
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Definitions vs Declarations, Definitions and Declarations (computer programming): Type definition - User-defined type definition, Variable definition - Constant definition, Class definition - Object definition, Constructor definition - Destructor definition, Struct definition - Record definition, Function definition - Method definition, Lambda definition - Anonymous function definition, Enumerator definition, Pointer definition, Generic definition - Template definition, Interface definition - Protocol definition - Trait definition, Namespace definition - Package definition - Module definition - Alias definition - Import definition - Export definition, Macro definition. Programming terms. (navbar_definition)
- Snippet from Wikipedia: Variable (computer science)
In computer programming, a variable is an abstract storage location paired with an associated symbolic name, which contains some known or unknown quantity of data or object referred to as a value; or in simpler terms, a variable is a named container for a particular set of bits or type of data (like integer, float, string etc...). A variable can eventually be associated with or identified by a memory address. The variable name is the usual way to reference the stored value, in addition to referring to the variable itself, depending on the context. This separation of name and content allows the name to be used independently of the exact information it represents. The identifier in computer source code can be bound to a value during run time, and the value of the variable may thus change during the course of program execution.
Variables in programming may not directly correspond to the concept of variables in mathematics. The latter is abstract, having no reference to a physical object such as storage location. The value of a computing variable is not necessarily part of an equation or formula as in mathematics. Variables in computer programming are frequently given long names to make them relatively descriptive of their use, whereas variables in mathematics often have terse, one- or two-character names for brevity in transcription and manipulation.
A variable's storage location may be referenced by several different identifiers, a situation known as aliasing. Assigning a value to the variable using one of the identifiers will change the value that can be accessed through the other identifiers.
Compilers have to replace variables' symbolic names with the actual locations of the data. While a variable's name, type, and location often remain fixed, the data stored in the location may be changed during program execution.
Language Specifics
1. Bash Scripting
2. C Language
3. C++
4. C#
5. Clojure
6. COBOL
- COBOL function definition on IBM.com/docs
7. Dart
8. Elixir
9. Fortran
- Fortran function definition on IBM.com/docs
10. Go
11. Groovy
12. Haskell
13. IBM REXX
- REXX function definition on IBM.com/docs
14. IBM JCL
- JCL function definition on IBM.com/docs
15. Java
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25. Microsoft T-SQL
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- Snippet from Wikipedia: Declaration (computer programming)
In computer programming, a declaration is a language construct specifying identifier properties: it declares a word's (identifier's) meaning. Declarations are most commonly used for functions, variables, constants, and classes, but can also be used for other entities such as enumerations and type definitions. Beyond the name (the identifier itself) and the kind of entity (function, variable, etc.), declarations typically specify the data type (for variables and constants), or the type signature (for functions); types may also include dimensions, such as for arrays. A declaration is used to announce the existence of the entity to the compiler; this is important in those strongly typed languages that require functions, variables, and constants, and their types to be specified with a declaration before use, and is used in forward declaration. The term "declaration" is frequently contrasted with the term "definition", but meaning and usage varies significantly between languages; see below.
Declarations are particularly prominent in languages in the ALGOL tradition, including the BCPL family, most prominently C and C++, and also Pascal. Java uses the term "declaration", though Java does not require separate declarations and definitions.
Also Listed As
Variables: Python Variable, Variable (computer science), Unassigned Variables, Variability, Mutable-Mutability, Immutable-Immutability, Constant-Constancy, Named object, Variable Declaration, Variable Definition, Control Variable (Programming), Non-Local Variable, Temporary Variable, Variable Interpolation, Scalar (Mathematics), Variable (Mathematics), Variable Topics. (navbar_variables - see also navbar_math, navbar_programming)
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