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48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
The [[$DYNAMIC]] [[Metacommand|metacommand]] allows the creation of dynamic (changeable) arrays.
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{{PageSyntax}}
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:{[[REM]] | ' } [[$DYNAMIC]]
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{{PageDescription}}
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* QBasic [[Metacommand|metacommands]] require [[REM]] or [[Apostrophe|apostrophe]] (') before them and are always placed at the start of the main module.
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* Dynamic arrays can be resized using [[REDIM]]. The array's type cannot be changed.
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* All data in the array will be lost when [[REDIM]]ensioned except when [[_PRESERVE]] is used.
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* [[REDIM]] [[_PRESERVE]] can preserve and may move the previous array data when the array boundaries change.
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* [[_PRESERVE]] allows the [[UBOUND|upper]] and [[LBOUND|lower]] boundaries of an array to be changed. The number of dimensions cannot change.
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* [[$DYNAMIC]] arrays must be [[REDIM]]ensioned if [[ERASE]] or [[CLEAR]] are used as the arrays are removed completely.
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{{PageExamples}}
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''Example:'' [[REDIM]]ing a $DYNAMIC array using [[_PRESERVE]] to retain previous array values.
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{{CodeStart}} '' ''
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{{Cl|REM}} {{Cl|$DYNAMIC}} 'create dynamic arrays only
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{{Cl|DIM}} array(10) 'create array with 11 elements
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 10
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array(i) = i: {{Cl|PRINT}} array(i); 'set and display element values
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{{Cl|NEXT}}
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{{Cl|PRINT}}
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{{Cl|REDIM}} {{Cl|_PRESERVE}} array(10 {{Cl|TO}} 20)
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{{Cl|FOR...NEXT|FOR}} i = 10 {{Cl|TO}} 20
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{{Cl|PRINT}} array(i);
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{{Cl|NEXT}}
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{OutputStart}}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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{{OutputEnd}}
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{{PageSeeAlso}}
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* [[$STATIC]], [[$INCLUDE]]
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* [[DIM]], [[REDIM]], [[_DEFINE]]
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* [[STATIC]]
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* [[ERASE]], [[CLEAR]]
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* [[Arrays]], [[Metacommand]]
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{{PageNavigation}}
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