$DYNAMIC

The $DYNAMIC metacommand allows the creation of dynamic (changeable) arrays.

Syntax

QBasic metacommands require REM or apostrophe (') before them and are always placed at the start of the main module.
Dynamic arrays can be resized using REDIM. The array's type cannot be changed.
All data in the array will be lost when REDIMensioned except when _PRESERVE is used.
REDIM _PRESERVE can preserve and may move the previous array data when the array boundaries change.
_PRESERVE allows the upper and lower boundaries of an array to be changed. The number of dimensions cannot change.
$DYNAMIC arrays must be REDIMensioned if ERASE or CLEAR are used as the arrays are removed completely.

Example: REDIMing a $DYNAMIC array using _PRESERVE to retain previous array values.

REM $DYNAMIC 'create dynamic arrays only DIM array(10) 'create array with 11 elements FOR i = 0 TO 10 array(i) = i: PRINT array(i); 'set and display element values NEXT PRINT REDIM _PRESERVE array(10 TO 20) FOR i = 10 TO 20 PRINT array(i); NEXT END

0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10