$DYNAMIC

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


Syntax

{REM | ' } $DYNAMIC


Description

  • QBasic metacommands require REM or apostrophe (') before them and are normally 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.


Examples

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


See also



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