$NOPREFIX: Difference between revisions

Revision as of 23:22, 10 January 2023

The $NOPREFIX metacommand allows all QB64 functions and statements to be used without the leading underscore (_).

QB64-specific keywords are by default prefixed with an underscore, in order to differentiate them from legacy keywords inherited from QBasic/QuickBASIC 4.5.
The convention exists in order to allow older code to be loaded and compiled in QB64 without naming conflicts with existing variables or constants.
If you are writing new code with QB64, and not importing code from QBasic/QuickBASIC 4.5, $NOPREFIX allows you to reduce typing by not having to use underscores in modern keywords.
SUB _GL still must be prefixed.
When $NOPREFIX is used, QB64 keywords can be used both with or without the leading underscore, so that both _DISPLAY and DISPLAY are valid in the same program, for example.
$NOPREFIX must be the first non-comment and non-whitespace line in a program.
- Since QB64 v2.0 (incl. all QB64-PE versions) $NOPREFIX can be placed anywhere in a program.

@@ Line 13: / Line 13: @@
 * When [[$NOPREFIX]] is used, QB64 keywords can be used both with or without the leading underscore, so that both [[_DISPLAY]] and [[_DISPLAY|DISPLAY]] are valid in the same program, for example.
 * [[$NOPREFIX]] must be the first non-comment and non-whitespace line in a program.
-** Since QB64 2.0 respectively QBPE 0.5 [[$NOPREFIX]] can be placed anywhere in a program.
+** Since QB64 v2.0 (incl. all QB64-PE versions) [[$NOPREFIX]] can be placed anywhere in a program.
 {{PageAvailability}}
-* '''QB64 1.4 and up''' (QB64 Team)
+* '''QB64 v1.4 and up'''
-* '''QBPE 0.5 and up''' (QB64 Phoenix Edition)
+* '''QB64-PE all versions'''