Remote-processing CAMBASIC Manuale Utente Scaricare il pdf (Pagina 119)

Commands - 86

ON ERR GOTO

Statement

SYNTAX: ON ERR GOTO line/label

PURPOSE: To enable error trapping and specify the first line of the error handling subroutine.

REMARK S: Once error trapping has been enabled, all error s detected by CAMBASIC during run tim e cause

CAMBASIC to branch to the specified line.

To disable error trapping, execute an ON ERR without the line number. If the routine beginning at

line has an error, an infinite loop will be set up. In this case, do a hardware reset and execute the

UNNEW! command. The error trapping subroutine should be tested before executing an ON ERR

statement.

The ON ER R GO TO line statement m ust be performed ever y time an er ror occurs if yo u wish to

continue to trap on errors. The best place to do this is in the error handling routine.

RELATED: RESUME, RESUME NEXT

EXAMPLE: 10 ON ERR GOTO 100

20 A=5/0

30 END

100 PRINT "DIV BY ZERO"

110 ON ERR GOTO 100

120 RESUME NEXT

In this case just using RESUM E without the NEXT would cause line 20 to be executed again,

producing another error.

10 ON ERR GOTO : 'disable error trapping

ERROR: < Can’t compile> – if line/label does not exist

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 207 208

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Remote-processing CAMBASIC Manuale Utente Pagina 119