Errors And Warnings

HUNTER’S Basic Interpreter will display one of a number of messages on an error occurring.

The messages have three characters, generally with a line number. The meaning may be found with reference to the following table. They are aimed at experienced programmers.

Each error has an error number. This is the value returned by the ERR verb and is useful during error trapping.

Message	No.	Meaning
ARG	0	ARGUMENT ERROR: A function has been called with an out of range argument.
STX	1	SYNTAX ERROR: Incorrect syntax in a Basic statement.
CSK	2	CONTROL STACK ERROR: Incorrect F0R…NEXT; WHILE…WEND or GOSUB…RETURN construction.
SSK	3	SYSTEM STACK ERROR: Attempt to POP a nonexistent variable.
DIN	4	DIRECT INPUT ERROR: Use of a meaningless Basic statement as a command, e.g. NEXT.
DIM	5	DIMENSION ERROR: Attempt to redefine an existing variable.
FP	6	FLOATING POINT ERROR: Illegal maths operation, e.g. B=A/C where C=0.
LNo	7	LINE NUMBER ERROR: Reference to a nonexistent line number.
SQR	8	NEGATIVE SQUARE ROOT:
MAC	9	MAGNITUDE ERROR: Reference to an array element larger than the array dimension.
RD	10	READ ERROR: The data statement is either invalid or non-existent.
MEM	11	STORAGE OVERFLOW: Variable storage or array overflowed available memory.
ARY	12	ARRAY ERROR: Use of an element in an undefined array.
BAS	13	BASIC SOURCE ERROR: Attempt to run a non-Basic program.
HLP	14	HELP SOURCE ERROR: The HELP statement has an Illegal line number reference.
TYP	15	TYPE MISMATCH ERROR: Received string data type instead of numeric.
STR	16	STRING COMPLEX ERROR: Insufficient space to manipulate a string expression.
RES	17	RESUME WITHOUT ERROR:
FNF	18	FILE NOT FOUND: Reference to a non-existent file.
IFN	19	ILLEGAL FILE NAME: Filename does not conform to standards of file names.
FOP	20	FILE ALREADY OPEN:
FNO	21	FILE NUMBER ERROR: File number greater than MAXFILE.
FCL	22	FILE CLOSED ERROR:
FOO	23	FILE OPEN FOR OUTPUT ERROR:
FOI	24	FILE OPEN FOR INPUT ERROR:
WWD	25	WHILE/WEND ERROR: WHILE without WEND or WEND without WHILE.
DSK	26	DISK ACCESS ERROR:
???	27-255	USER DEFINED ERROR: