In imperative programming languages, values can generally be accessed or changed at any time. In pure functional and logic languages, … See more

The scope of a variable describes where in a program's text the variable may be used, while the extent (also called lifetime) of a variable describes when in a program's execution … See more

The specifics of variable allocation and the representation of their values vary widely, both among programming languages and among implementations of a given language. Many language implementations allocate space for local variables See more

An identifier referencing a variable can be used to access the variable in order to read out the value, or alter the value, or edit other attributes of the variable, such as access permission, See more

In statically typed languages such as Go or ML, a variable also has a type, meaning that only certain kinds of values can be stored in it. For … See more

The formal parameters (or formal arguments) of functions are also referred to as variables. For instance, in this Python code segment,
the variable named x is a parameter because it is given a value when the function is called. … See more

Unlike their mathematical counterparts, programming variables and constants commonly take multiple-character names, e.g. COST or total. … See more