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51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
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The [$DYNAMIC]($DYNAMIC) [Metacommand](Metacommand) allows the creation of dynamic (resizable) arrays.
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## Syntax
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> {[REM](REM) | ['](apostrophe) } [$DYNAMIC]($DYNAMIC)
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## Description
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* QBasic [Metacommand](Metacommand) require [REM](REM) or [Apostrophe](Apostrophe) (') before them and are normally placed at the start of the main module.
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* Dynamic arrays can be resized using [REDIM](REDIM). The array's type cannot be changed.
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* All data in the array will be lost when [REDIM](REDIM)ensioned except when [_PRESERVE](_PRESERVE) is used.
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* [REDIM](REDIM) [_PRESERVE](_PRESERVE) can preserve and may move the previous array data when the array boundaries change.
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* [_PRESERVE](_PRESERVE) allows the [UBOUND](UBOUND) and [LBOUND](LBOUND) boundaries of an array to be changed. The number of dimensions cannot change.
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* [$DYNAMIC]($DYNAMIC) arrays must be [REDIM](REDIM)ensioned if [ERASE](ERASE) or [CLEAR](CLEAR) are used as the arrays are removed completely.
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## Example(s)
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[REDIM](REDIM)ing a $DYNAMIC array using [_PRESERVE](_PRESERVE) to retain previous array values.
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```vb
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REM $DYNAMIC 'create dynamic arrays only
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DIM array(10) 'create array with 11 elements
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FOR i = 0 TO 10
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array(i) = i: PRINT array(i); 'set and display element values
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NEXT
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PRINT
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REDIM _PRESERVE array(10 TO 20)
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FOR i = 10 TO 20
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PRINT array(i);
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NEXT
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END
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```
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```text
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0 1 2 3 4 5 6 7 8 9 10
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0 1 2 3 4 5 6 7 8 9 10
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```
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## See Also
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* [$STATIC]($STATIC), [$INCLUDE]($INCLUDE)
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* [DIM](DIM), [REDIM](REDIM), [_DEFINE](_DEFINE)
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* [STATIC](STATIC)
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* [ERASE](ERASE), [CLEAR](CLEAR)
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* [Arrays](Arrays), [Metacommand](Metacommand)
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