Release 10.1A: OpenEdge Development:
Progress 4GL Reference

EXTENT function

This function returns the extent of an array field or variable. More specifically, it returns:

The constant or variable extent value for a field or variable defined as a determinate array.
The Unknown value (?) for a field or variable defined as an unfixed indeterminate array.
The extent for a field or variable defined as a fixed indeterminate array.
Zero for a field or variable that is not an array.
Note: The EXTENT function corresponds to the EXTENT attribute.

Syntax

EXTENT ( array )

array

Any array field or variable.

Example

In the following example, the EXTENT function is used to set the limit of a DO loop that cycles through all elements of an array:

r-arrext.p

DEFINE VARIABLE int_value AS INTEGER EXTENT 3 INITIAL [1, 2, 3]. DEFINE VARIABLE i AS INTEGER. DEFINE VARIABLE tot AS INTEGER LABEL "The total is". DO i = 1 TO EXTENT(int_value): tot = tot + int_value[i]. END. DISPLAY tot.

See also

DEFINE VARIABLE statement, ENTRY function, EXTENT attribute