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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
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}} |