# Variables

Variables store numbers, strings, file descriptors, or
select lists and can change dynamically throughout the execution of
the program.

Values can be assigned with an assignment statement. Assignment
statements assign the value of an expression to a variable. Variables
can be:

- Simple variables

- Array elements

- Dynamic array elements

- Substrings

For example `var=x+2` assigns the value of
the expression `x+2` to the variable *var*.

A program variable is similar to a mathematical
variable found in formulas.

A numeric string, when used in an
arithmetical expression, is converted to a numeric expression, and
a numeric expression is converted to a string expression when used
with a string operator.

A variable name identifies the variable.
Variable names consist of an alphabetical character that can be followed
by additional letters, numerals, periods, dollar signs, and the underscore
character. The length of a variable name can be from 1 to 48 characters.
Up to 214,748,363 variables can be defined.

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Source: https://d3codex.com/pickbasic-flashbasic/variables/ - part of the D3Codex reference.