ERROR: Difference between revisions

From QB64 Phoenix Edition Wiki
Jump to navigation Jump to search
No edit summary
No edit summary
Tag: Manual revert
Line 15: Line 15:
''Example:'' Creating custom error codes for a program that can be handled by an [[ON ERROR]] handling routine.
''Example:'' Creating custom error codes for a program that can be handled by an [[ON ERROR]] handling routine.
{{CodeStart}} '' ''
{{CodeStart}} '' ''
{{C1|ON ERROR}} {{Cl|GOTO}} handler
{{Cl|ON ERROR}} {{Cl|GOTO}} handler


{{Cl|IF...THEN|IF}} x = 0 {{Cl|THEN}} {{Cl|ERROR}} 123
{{Cl|IF...THEN|IF}} x = 0 {{Cl|THEN}} {{Cl|ERROR}} 123

Revision as of 17:30, 19 April 2022

The ERROR statement is used to simulate a program error or to troubleshoot error handling procedures.


Syntax

ERROR codeNumber%


Description

  • Can be used to test an error handling routine by simulating an error.
  • Error code 97 can be used to invoke the error handler for your own use, no real error in the program will trigger error 97.
  • Use error codes between 100 and 200 for custom program errors that will not be responded to by QB64.


Examples

Example: Creating custom error codes for a program that can be handled by an ON ERROR handling routine.

  
ON ERROR GOTO handler

IF x = 0 THEN ERROR 123
x = x + 1
IF x THEN ERROR 111

END


handler:
PRINT ERR, _ERRORLINE
BEEP
RESUME NEXT  
Note: Don't use error codes under 97 or over 200 as QB64 may respond to those errors and interrupt the program.


See also



Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage
Report a broken link