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QB64-website/wiki/ERR.md
Cory Smith ca88ba2965 More wiki experiment.
2022-12-24 19:12:43 -06:00

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The ERR function returns the last QBasic error code number.

Syntax

errorNum% = ERR

Description

  • If there is no error, the function returns 0
  • Can be used in an error handling routine to report the last error code number.

Example(s)

Simulating an error to test a program error handler that looks for a "Subscript out of range" error.


ON ERROR GOTO handler

IF x = 0 THEN ERROR 111  'simulate an error code that does not exist
x = x + 1
IF x THEN ERROR 9        'simulate array boundary being exceeded

END

handler:
PRINT ERR, _ERRORLINE
BEEP
IF ERR = 9 THEN
  PRINT "The program has encountered an error and needs to close! Press a key!"
  K$ = INPUT$(1)
  SYSTEM
END IF
RESUME NEXT               'RESUME can only be used in error handlers

See Also