Language Reference

Array Elements

Array elements are the scalar data that make up an array. Each element inherits the type, type parameters, and INTENT, PARAMETER, and TARGET attributes from its parent array. The POINTER attribute is not inherited.

You identify an array element by an array element designator, whose form is:

>>---+-array_name--------+--(--subscript_list--)---------------><
     '-array_struct_comp-'
 
 

array_name

is the name of an array

array_struct_comp

is a structure component whose rightmost comp_name is an array

subscript

is an scalar integer expression

+-------------------------------IBM Extension--------------------------------+

A subscript is a real expression in XL Fortran.

+----------------------------End of IBM Extension----------------------------+

Notes

• The number of subscripts must equal the number of dimensions in the array.
• If array_struct_comp is present, each part of the structure component except the rightmost must have rank zero (that is, must not be an array name or an array section).
• The value of each subscript expression must not be less than the lower bound or greater than the upper bound for the corresponding dimension.

The subscript value depends on the value of each subscript expression and on the dimensions of the array. It determines which element of the array is identified by the array element designator.

Related Information:

Structure Components

Array Sections and Structure Components

Array Element Order

The elements of an array are arranged in storage in a sequence known as the array element order, in which the subscripts change most rapidly in the first dimension, and subsequently in the remaining dimensions.

For example, an array declared as A(2, 3, 2) has the following elements:

 Position of Array Element             Array Element Order
 -------------------------             -------------------
          A(1,1,1)                              1
          A(2,1,1)                              2
          A(1,2,1)                              3
          A(2,2,1)                              4
          A(1,3,1)                              5
          A(2,3,1)                              6
          A(1,1,2)                              7
          A(2,1,2)                              8
          A(1,2,2)                              9
          A(2,2,2)                             10
          A(1,3,2)                             11
          A(2,3,2)                             12