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46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
The '''$DYNAMIC''' Metacommand allows the creation of dynamic(changeable) array sizes.
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{{PageSyntax}}
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::REM $DYNAMIC
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* Qbasic [[Metacommand]]s require a REM or apostrophy (') 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 in QB64 only.
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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 can also be resized by the program user's input if desired.
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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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''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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''See also:''
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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}} |