Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

Arrays

DIMENSION attribute
DIMACROSS attribute
Examples of arrays
Subscripts
Cross sections of arrays

An array is an n-dimensional collection of elements that have identical attributes. Only the array itself is given a name. An individual item of an array is referred to by giving its position within the array. You indicate that a name is an array variable by providing the dimension attribute.

Unless specified using REFER, every dimension of every array must have at least one element. When the bounds of an array are specified using REFER, then the array may be defined to have zero elements as long as

So, for example, given the following code, it would be valid to allocate the array a when n1 was zero as long as ab3, abc1 and abc2 were neither accessed nor assigned.

   dcl n1          fixed bin(31);
   dcl p           pointer;
   dcl
     1 a based(p),
       2 ab1       fixed bin(31),
       2 ab2       fixed bin(31),
       2 ab3( n1 refer(ab2) ),
         3 abc1    char(40) var,
         3 abc2    char(40) var,
       2 ab4       char(40) var;

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