Identifier Rules
Naming conventions for FreeBASIC symbols.
Description
An identifier is a symbolic name which uniquely identifies a variable, `Type`, `Union`, `Enum`, `Function`, `Sub`, or `Property`, within its scope or `Namespace`.
Identifiers may contain only uppercase and lowercase Latin characters `a`-`z` and `A`-`Z`), digits (`0`-`9`), and the underscore character (`_`). The first character of an identifier must be a letter or underscore, not a digit.
Identifiers are case-insensitive: `FOO` and `foo` (and all other permutations of uppercase and lowercase) refer to the same symbol.
In the -lang qb and -lang fblite dialects, identifiers may have a type suffix at the end indicating one of the standard data types:

- `%` for `Integer`
- `&` for `Long`
- `!` for `Single`
- ``# for `Double`
- `$` for `String`

The use of these symbols is generally discouraged in and is not allowed in the -lang fb dialect (the default).
The alternative is to be explicit - for example, `Dim As Integer foo` or `Dim foo As Integer` instead of `Dim foo%`.
In the -lang qb and -lang fblite dialects, identifiers may contain one or more periods (`.`).
Dialect Differences

- Periods in symbol names are only supported in the -lang qb and -lang fblite dialects.

Differences from QB

- Support for the underscore character (`_`) in symbol names is new to FreeBASIC.

See also

- Variables