BASIC FUNCTIONS
SECTION 5.6
5.6.5
ERROR
Function ERROR simulates a Basic error with the advantage that it
allows user defined codes. For a list of Bsic error
messages, see section 4. 14.
Syntax ERROR n
where O<n<255
Example 10 INPUTa,b
20 ONERRORGOT0100
30 IFa>bTHENERROR156
40 GOT010
100 IFERR
= 156THENPRINT"a>b error"
110 RESUME 1 0
Remarks The ERROR statement neatly traps errors and forces the
printing of a Basic error message. If the error number is
undefined in Basic, then processing can be forced to
restart at another line to print a user defined message.
When ERROR is set to n, this number may be recovered with
ERR, and the line number with ERL.
After a forced user error trap, a suitable RESUME command
must be executed to ensure correct program operation.
VER.V09F
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