Remote-processing CAMBASIC Instrukcja Użytkownika Pobierz pdf (Strona 77)

Commands - 44

ERR

System Variable

SYNTAX: n = ERR

PURPOSE: To return the error code associated with an error.

REMARK S: The function returns the error code for the last error. It is usually used in conjunction with the ERL

function.

Error trapping is essential in control applications, where a halt in execution is not tolerable.

See the Err or Messages Chapter for a list of error codes and messages.

RELATED: ERL, ON ERR, RESUM E, ERR statement

EXAMPLE: 10 ON ERR GOTO 50 : ’enable error trapping

20 INPUT"Enter a number to divide by. (0 will cause error) : ",A

30 B=10 / A

40 GOTO 20

50 PRINT"Error#" ; ERR ; "occurred on line#";ERL

60 ON ERR GOTO 50 : ’re-enable error trapping

70 RESUME NEXT : ‘resume at next statement after error

ERROR: none

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Remote-processing CAMBASIC Instrukcja Użytkownika Strona 77