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CLEAR

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The CLEAR' statement clears all variable and array element values in a program. It does not affect constant values!


Syntax: CLEAR [, stacksize& , stackspace&]


Description:

  • Optional stacksize parameter was not required as Qbasic managed that. All three parameters are ignored by QB64!
  • The stackspace parameter sets the stack space to be added to the stack. Two commas kept Qbasic compatible with BASICA.
  • Normally used to clear all program variable and array values where numerical values become zero and string values become null.
  • It does not clear constant values.
  • Closes all opened files also.
  • $DYNAMIC arrays will need to be re-dimensioned or an error will occur when referenced because the array is removed.


Example: Using CLEAR to clear array elements.

CLS DIM array(10) 'create a $STATIC array array(5) = 23 PRINT array(5) CLEAR PRINT array(5)

Note: If you change DIM to REDIM a "Subscript out of range" error will occur because a $DYNAMIC array is removed by CLEAR.


See also:



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