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The OPTION BASE statement is used to set the default lower bound of arrays.




  • This statement affects array declarations where the lower bound of a dimension is not specified.
  • When used, OPTION BASE must come before any array declarations (DIM) to be affected.
  • By default, the lower bound for arrays is zero, and may be changed to one using the statement.
  • Otherwise, arrays will be dimensioned from element 0 if you DIM just the upper bounds.
  • You can also set other array boundaries by using TO in the DIM declaration such as DIM array(5 TO 10)
  • Note: OPTION and BASE cannot be used as numerical variable names.


Example 1: Set the default lower bound for array declarations to one.

OPTION BASE 1 ' Declare a 5-element one-dimensional array with element indexes of one through five. DIM array(5) AS INTEGER PRINT LBOUND(array)


Example 2: Set the default lower bound for array declarations to zero.

OPTION BASE 0 ' Declare an 18-element two-dimensional array with element indexes of zero through two ' for the first dimension, and 10 through 15 for the second dimension. DIM array(2, 10 to 15) AS INTEGER PRINT LBOUND(array, 1) PRINT LBOUND(array, 2)

0 10

See also

Keyword Reference - Alphabetical
Keyword Reference - By Usage
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