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46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
The [[ERR]] function returns the last QBasic error code number.
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{{PageSyntax}}
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: {{Parameter|errorNum%}} = [[ERR]]
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{{PageDescription}}
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* If there is no error, the function returns 0
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* Can be used in an error handling routine to report the last error code number.
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{{PageExamples}}
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''Example:'' Simulating an error to test a program error handler that looks for a "Subscript out of range" error.
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{{CodeStart}} '' ''
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{{Cl|ON ERROR}} {{Cl|GOTO}} handler
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{{Cl|IF...THEN|IF}} x = 0 {{Cl|THEN}} {{Cl|ERROR}} 111 'simulate an error code that does not exist
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x = x + 1
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{{Cl|IF...THEN|IF}} x {{Cl|THEN}} {{Cl|ERROR}} 9 'simulate array boundary being exceeded
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{{Cl|END}}
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handler:
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{{Cl|PRINT}} {{Cl|ERR}}, {{Cl|_ERRORLINE}}
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{{Cl|BEEP}}
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{{Cl|IF...THEN|IF}} {{Cl|ERR}} = 9 {{Cl|THEN}}
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{{Cl|PRINT}} "The program has encountered an error and needs to close! Press a key!"
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K$ = {{Cl|INPUT$}}(1)
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{{Cl|SYSTEM}}
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{{Cl|END IF}}
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{{Cl|RESUME}} {{Cl|NEXT}} 'RESUME can only be used in error handlers '' ''
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[ON ERROR]], [[RESUME]]
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* [[ERL]]
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* [[_ERRORLINE]], [[_INCLERRORLINE]], [[_INCLERRORFILE$]]
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* [[ERROR]]
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* [[ERROR Codes]]
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{{PageNavigation}}
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