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File No. S360-29
Form C28-6571-3



I
,




Systems Reference Library




IBM System/3S0 Operating System
PL/I Language Specifications

This manual is a description of the full
facilities of PL/I to be implemented under the
System/360 Operating System. However. the reader
should not assume that all facilities will be
available at initial release. Manuals for speci-
fic System/360 implementations will be released
later.
Another publication will be issued specifying a
subset of the facilities of the language described
in this manual. This subset is planned for
implementation under the System/360 Disk and
Operating System.
PREFACE




This publication is a reference manual directed toward the programmer who has
for the entire PL/I Language. All of the a working knowledge of FORTRAN.
features to be implemented under the
System/360 Operating System are described
herein. 3. A Guide to PL/I for Coremerical Pro-
grammers, Student Text, Form C20-1651,
However, this manual does not approach is intended for the programmer who has
PL/I from a tutorial point of view. There experience in commercial applications.
are other IBM publications that perform Comparisons between PL/I and COBOL
this function. These publications and (COmmon Business Oriented Language)
their intended audience are as follows: are included in this guide.
1. A PL/I Primer, student Text, Form
C28-6808, is intended for the novice Introductory information about PL/I may
programmer who has little or' no knowl- also be found in the Student Text, An
edge of data processing, as well as Introduction to PL/I, Form C20-1632.
for the experienced programmer who
wants to learn PL/I.
A familiarity with the contents of A
2. A Guide to PL/I for FORTRAN Users, PL/I Primer is recorrmended for the users of
student Text, Form C20-1637, is this reference manual.




MAJOR REVISION (JULY, 1966)

This publication, Form C28-6571-3, obsoletes
the previous edition, Form C28-6571-2. New tex-
tual information and significant changes are iden-
tified by vertical lines to the left of the added
and changed text.

Among the additions and significant changes are
(1) the complete respecification of compile-time
facilities (Chapter 9), (2) the new attributes
REDUCIBLE and IRREDUCIBLE, and (3) the new data
type called cell (and its corresponding CELL
attribute).

Because Chapter 9 has been completely
rewritten, vertical bars have not been used to
indicate changes; this chapter should be re-read
in its entirety.



Copies of this and other IBM publications can be obtained through IBM Branch
Offices.
A form for readers' comments appears at the back of this publication. It may
be mailed directly to IBM. Address any additional comments concerning this
publication to the IBM Corporation., Programming Systems Publications, Department
D39" 1271 Avenue of the Americas. New York, N. Y., 10020.