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37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
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The ''CLEAR''' statement clears all variable and array element values in a program. It does not affect constant values!
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''Syntax:'' CLEAR [, ''stacksize&'' , ''stackspace&'']
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{{PageDescription}}
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* Optional ''stacksize'' parameter was not required as Qbasic managed that. '''All three parameters are ignored by QB64!'''
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* The ''stackspace'' parameter sets the stack space to be added to the stack. Two commas kept Qbasic compatible with BASICA.
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* Normally used to clear all program variable and [[Arrays|array]] values where numerical values become zero and string values become null.
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* It does not clear [[CONST|constant]] values.
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* Closes all opened files also.
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* [[$DYNAMIC]] arrays will need to be [[REDIM|re-dimensioned]] or an [[ERROR Codes|error]] will occur when referenced because the array is removed.
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''Example:'' Using CLEAR to clear array elements.
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{{CodeStart}} '' ''
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{{Cl|CLS}}
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{{Cl|DIM}} array(10) 'create a {{Cl|$STATIC}} array
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array(5) = 23
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{{Cl|PRINT}} array(5)
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{{Cl|CLEAR}}
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{{Cl|PRINT}} array(5) '' ''
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{{CodeEnd}}
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:''Note:'' If you change DIM to REDIM a "Subscript out of range" error will occur because a [[$DYNAMIC]] array is removed by CLEAR.
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{{PageSeeAlso}}
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* [[ERASE]]
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* [[REDIM]]
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* [[Arrays]]
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{{PageNavigation}}
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