GWBASIC User's Manual

GW-BASIC User's Guide
The GW-BASIC statements DEFINT, DEFSTR, DEFSNG, and DEFDBL may be included in a
program to declare the types of values for certain variable names.
6.2.3 Array Variables
An array is a group or table of values referenced by the same variable name. Each element in an
array is referenced by an array variable that is a subscripted integer or an integer expression. The
subscript is enclosed within parentheses. An array variable name has as many subscripts as there
are dimensions in the array.
For example,
V(10)
references a value in a one-dimensional array, while
T(1,4)
references a value in a two-dimensional array.
The maximum number of dimensions for an array in GW-BASIC is 255. The maximum number
of elements per dimension is 32767.
Note
If you are using an array with a subscript value greater than 10, you should use the DIM
statement. Refer to the GW-BASIC User's Reference for more information. If a subscript greater
than the maximum specified is used, you will receive the error message "Subscript out of
range."
Multidimensional arrays (more than one subscript separated by commas) are useful for storing
tabular data. For example, A(1,4) could be used to represent a two-row, five-column array such
as the following:
Column 0 1 2 3 4
Row 0 10 20 30 40 50
Row 1 60 70 80 90 100
In this example, element A(1,2)=80 and A(0,3)=40.
Rows and columns begin with 0, not 1, unless otherwise declared. For more information, see the
OPTION BASE statement in the GW-BASIC User's Reference.
6.2.4 Memory Space Requirements for Variable Storage
The different types of variables require different amounts of storage. Depending on the storage
file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/Chapter 6.html (4 of 12)28/03/2004 21.29.00