To specify the maximum values for array variable subscripts and allocate storage accordingly.
DIM [ SHARED ] variable_name [ ( subscripts )] [ AS type ] [, variable_name [ ( subscripts ) ] [ AS type ] ]…
The SHARED keyword allows subprograms and functions to share the same variable without passing the variable as a parameter.
variable_name is the name of the array.
subscripts is the dimensions of the array. If you have not previously defined an array in a DIM statement, you can assign a value to an element that has subscript ranging from 0 to 10. You can change the lower and upper bounds as shown here:
DIM a(0 TO 8) ' a(0) to a(8)
DIM b(1 TO 10) ' b(1) to b(10)
If you specify only one subscript, QBasic assumes that it is the upper bound and uses 0 for the lower bound unless you include and OPTION BASE statement.
For multidimensional arrays, simply separate the subscripts of each array dimension with commas:
DIM box(3, 3)
DIM bigbox(1 TO 10, 1 TO 10)
The maximum number of array dimensions is 60.
Valid types include INTEGER, LONG, SINGLE, DOUBLE, STRING and user-defined types.
DIM a(25 TO 100) AS INTEGER
DIM b(1 TO 10, 1 TO 5) AS DOUBLE
TYPE Schedule
day AS STRING * 10
hours AS INTEGER
END TYPE
DIM workday AS Schedule