Commodore VIC-20 - DIM

Appendix G: BASIC Statements 345
DIM
The Dimension statement DIM allocates space in memory for array
variables.
Format:
DIM var(sub )[, var(sub ), ... , var(sub)]
The DIM statement identifies arrays with one or more dimensions as
follows:
var(subj) Single-dimensional array
var(subj,sub
j
) Two-dimensional array
var(subj,subj,sub,J Multiple-dimensional array
Arrays with more than 11 elements must be dimensioned in a DIM
statement. Arrays with
11 elements or less (subscripts 0 through 10 for a
one-dimensional array) may be used without being dimensioned by a DIM
statement; for such arrays,
11 array spaces are automatically allocated in
memory when the first array element
is encountered in the program. An
array with more than
11 elements must occur in a DIM statement before any
other statement references an element of the array.
If an array is dimensioned more than once, or if an array having more
than
11 elements is not dimensioned, an error occurs and the program is
aborted. A CLR statement allows a DIM statement to be reexecuted.
Example:
118 DIM A(3)
4:5 DIM X'(44J2)
1000 DIM MU(XJ3*B)JN(12)
END
Dimension a single-dimensional array
of 3 elements
Dimension a two-dimensional array
of
88 elements
Dimension a two-dimensional array
of
X times 3*B elements and a
single-dimensional array of 12
elements. X and B must have been
assigned values before the DIM
statement is executed
The END statement terminates program execution and returns the
computer to immediate mode.
Format:
END