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(Created page with "The ERR function returns the last QBasic error code number. {{PageSyntax}} : {{Parameter|errorNum%}} = ERR {{PageDescription}} * If there is no error, the function returns 0 * Can be used in an error handling routine to report the last error code number. {{PageExamples}} ''Example:'' Simulating an error to test a program error handler that looks for a "Subscript out of range" error. {{CodeStart}} '' '' {{Cl|ON ERROR}} {{Cl|GOTO}} handler {{Cl|IF...THEN|IF...") |
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The [[ERR]] function returns the last QBasic error code number. | The [[ERR]] function returns the last QBasic error code number. | ||
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{{PageExamples}} | {{PageExamples}} | ||
''Example:'' Simulating an error to test a program error handler that looks for a "Subscript out of range" error. | ''Example:'' Simulating an error to test a program error handler that looks for a "Subscript out of range" error. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|ON ERROR}} {{Cl|GOTO}} handler | {{Cl|ON ERROR}} {{Cl|GOTO}} handler | ||
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{{Cl|SYSTEM}} | {{Cl|SYSTEM}} | ||
{{Cl|END IF}} | {{Cl|END IF}} | ||
{{Cl|RESUME}} {{Cl|NEXT}} 'RESUME can only be used in error handlers | {{Cl|RESUME}} {{Cl|NEXT}} 'RESUME can only be used in error handlers | ||
{{CodeEnd}} | {{CodeEnd}} | ||
Latest revision as of 01:34, 23 January 2023
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.
Examples
Example: 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