OPTION BASE
The OPTION BASE statement is used to set the default lower bound of arrays.
Syntax
- OPTION BASE {0|1}
Description
- This statement affects array declarations where the lower bound of a dimension is not specified.
- When used, OPTION BASE must be placed before any array declarations (DIM or REDIM) and/or TYPEs which are defining arrys in it, best place is the first line of your program.
- By default, the lower bound for arrays is zero(0), and may be changed to one(1) using this 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)
Availability
-
all -
all -
-
yes -
yes -
yes
Examples
- 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) |
1 |
- 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