Metacommand: Difference between revisions
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(Created page with "'''Metacommands''' are program wide commands that start with $. ==Legacy metacommands (Qbasic/QuickBASIC)== ===Syntax=== :REM $INCLUDE: 'QB.BI' 'loads a reference file or library :REM $DYNAMIC 'enables resizing of array dimensions with REDIM :REM $STATIC 'arrays cannot be resized once dimensioned ===Description=== * Qbasic Metacommands are normally used at the program start and are in effect throughout the program. * Qbasic Metacommands are always pr...") |
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==Legacy metacommands ( | ==Legacy metacommands (QBasic/QuickBASIC)== | ||
===Syntax=== | ===Syntax=== | ||
:REM [[$INCLUDE]]: '[[QB.BI]]' 'loads a reference file or library | :REM [[$INCLUDE]]: '[[QB.BI]]' 'loads a reference file or library | ||
| Line 11: | Line 11: | ||
===Description=== | ===Description=== | ||
* | * QBasic Metacommands are normally used at the program start and are in effect throughout the program. | ||
* | * QBasic Metacommands are always prefixed with $ and MUST be commented with an apostrophe or [[REM]]. | ||
* [[$INCLUDE]] is always followed by a colon and the full text code file name is commented on both sides. | * [[$INCLUDE]] is always followed by a colon and the full text code file name is commented on both sides. | ||
* [[$DYNAMIC]] allows larger arrays that are changeable in size at runtime. | * [[$DYNAMIC]] allows larger arrays that are changeable in size at runtime. | ||
* [[$STATIC]] makes all arrays unchangeable in size. | * [[$STATIC]] makes all arrays unchangeable in size. | ||
* ''' | * '''QBasic metacommands should have their own program line because they are commented.''' | ||
Revision as of 09:50, 29 April 2022
Metacommands are program wide commands that start with $.
Legacy metacommands (QBasic/QuickBASIC)
Syntax
- REM $DYNAMIC 'enables resizing of array dimensions with REDIM
- REM $STATIC 'arrays cannot be resized once dimensioned
Description
- QBasic Metacommands are normally used at the program start and are in effect throughout the program.
- QBasic Metacommands are always prefixed with $ and MUST be commented with an apostrophe or REM.
- $INCLUDE is always followed by a colon and the full text code file name is commented on both sides.
- $DYNAMIC allows larger arrays that are changeable in size at runtime.
- $STATIC makes all arrays unchangeable in size.
- QBasic metacommands should have their own program line because they are commented.
QB64 metacommands
Syntax
- $CHECKING{OFF|ON} 'disables QB64 C++ event and error checking (no spaces)
- $CONSOLE 'creates a QB64 console window throughout the program
- $RESIZE:{ON|OFF} 'determines if re-sizing of the program screen by the user is allowed(no spaces)
- $SCREENHIDE 'hides the QB64 program window throughout the program
- $SCREENSHOW 'displays the main QB64 program window
- $EXEICON:'iconfile.ico' 'embeds an .ICO file into the final executable (Windows only)
- $VERSIONINFO:key=value 'embeds version info metadata into the final executable (Windows only)
Description
- $INCLUDE can be used at the beginning or at the end of program SUB procedures.
- $CHECKING:OFF should only be used with errorless code where every CPU cycle counts! Use ON to re-enable event checking. Event checking can be turned OFF or ON throughout a program.
- $CONSOLE creates a console window which can be turned off later with _CONSOLE OFF.
- $RESIZE:ON allows a user to resize the program window. OFF is default.
- $SCREENHIDE hides the QB64 program window throughout the program until $SCREENSHOW is used.
- $IF...$END IF allows selective inclusion of code in the final program.
- Do not comment out with ' or REM QB64-specific metacommands.
See also