Commodore Plus 4 - Page 410

398 Error Messages
17 UNDEFD STATEMENT
This message indicates that the current command refers to a line number that
does not exist in the program. For example, a GOTO or THEN command that
sends the program to a line that does not exist in the program results in an
UNDEF'D STATEMENT error.
18 BAD SUBSCRIPT
This message indicates that the current command refers to an array subscript that
is outside the array dimensions established in the array's DIM command or the
default array dimensions.
19 REDIM'D ARRAY
This message indicates that you have tried to reDIM an array that was previously
DIMed, that you have inadvertently reused an array variable name in another
DIM command, or that you have tried to DIM an array after you used the array
in the program. Arrays can be DIMensioned only once, and you cannot dimen
sion an array after you use it in the program even if you have not previously
DIMed the array. If you access an array before you DIM it, BASIC automatically
DIMs the array with a default dimension of 10. You cannot DIM an array after it
has been DIMed by default.
20 DIVISION BY ZERO
This message indicates that the current command tried to perform a division with
a divisor of zero, which is illegal. This usually happens when you are dividing with
variables and the divisor variable is assigned a value of zero. Use a TRAP routine
to check for this error to avoid aborting the program.
21 ILLEGAL DIRECT
This message indicates that you issued a command in immediate mode (also
called direct mode) that can be issued only in program mode.
22 TYPE MISMATCH
This message indicates that the current command assigns a value to the wrong
type of variable. For example, assigning a text string value to an integer variable
results in a TYPE MISMATCH error.