Apple IIe - Appendix D. Applesoft BASIC Error Messages

Appendix D 287
Appendix D. APPLESOFT BASIC ERROR MESSAGES
When an error occurs in Applesoft BASIC, an error message will
appear, and the program will return to the command level (i.e.
the ] prompt will appear). The error message will be displayed
using
the following configuration:
? name ERROR IN line
where name indicates the error name and line denotes the line
number where the error occured. If the error occurred in the
immediate mode, line will be omitted.
The program listing in memory is not affected by an error nor are
the stored variable values. However, all GOSUB and FOR loop
counters are reset to 0.
'~Vl f'l::l 1 -dl I '\!"l(lJ1 -tJtre,, -vt.'\:Ul '~t-i rt • t:n1Jf - ,, "\..vlrt: · wll 1 'ut: ·slurt:!U ' 111
memory address 222. By PEE King this address, the error code can
be determined.
The various Applesoft errors are discussed in the following table.
Error Message
Error
Error Description
Code
?BAD SECTOR
107
The program referenced an array
ERROR
element with a subscript not
defined in a DIM statement.
?CAN'T
CONTINUE None This error occurs when the program
ERROR attempted one of the following:
• Execution of CONT when a
program was not present in RAM.
• Execution of CONT after the
occurrence of a program error.
• Execution of CONT after the
program had been edited.
?DIVISION BY
133
Division by zero is not allowed.
ZERO ERROR