$DYNAMIC: Difference between revisions
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{{PageSyntax}} | {{PageSyntax}} | ||
:{[[REM]] | [[apostrophe|']] } [[$DYNAMIC]] | :{[[REM]] | [[apostrophe|']] } [[$DYNAMIC]] | ||
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''Example:'' [[REDIM]]ing a $DYNAMIC array using [[_PRESERVE]] to retain previous array values. | ''Example:'' [[REDIM]]ing a $DYNAMIC array using [[_PRESERVE]] to retain previous array values. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|REM}} {{ | {{Cl|REM}} {{Cm|$DYNAMIC}} 'create dynamic arrays only | ||
{{Cl|DIM}} array(10) 'create array with 11 elements | {{Cl|DIM}} array(10) 'create array with 11 elements | ||
{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 10 | {{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 10 | ||
| Line 28: | Line 28: | ||
{{Cl|PRINT}} array(i); | {{Cl|PRINT}} array(i); | ||
{{Cl|NEXT}} | {{Cl|NEXT}} | ||
{{Cl|END}} | {{Cl|END}} | ||
{{CodeEnd}} | {{CodeEnd}} | ||
{{OutputStart}}0 1 2 3 4 5 6 7 8 9 10 | {{OutputStart}}0 1 2 3 4 5 6 7 8 9 10 | ||
Latest revision as of 18:40, 27 February 2023
The $DYNAMIC metacommand allows the creation of dynamic (resizable) arrays.
Syntax
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