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                                              Form Y33-6003-0




                                       Language Specifications




IBM System/360


PL/I Language Specifications




   This publication is a description of the
PL/I language.    It does not describe any
implementation; nor can it be construed
that the publication implies any commitment
that the features are implemented or will
be implemented by IBM. The publication is
intended for the use of implementers and
programming language designers concerned
with language development and the study of
languages.




            Restricted Distribution
PREFACE



   This publication is a specifications                            A        PL/I   Primer,
                                                                                      Student Text~ Form
manual for the entire PL/I language. It is                         C28-6808, is intended  for the novice
not intended to reflect any implementation.                        programmer who has little or no knowl-
The book is designed for the use of implem-                        edge of data processing, as well as for
enters, systems programmers, and others who                        the experienced programmer who wants to
need to know the language beyond the pre-                          learn PL/I.
sent implementations. The following books
describe the language as implemented for
the F-Ievel compiler and the D-Ievel com-                          A Guide to PL/I for FORTRAN Users.
piler:                                                             Student Texto Form C20-1637, is direct-
                                                                   ed toward the programmer who has a
                                                                   working knowledge of FORTRAN..
      IBM _~stem/360: PL/I Reference Manual,
      Form C28-8201
                                                                   A Guide to PL/I for Commer~1al P~o~ram
      IBM System/360: PL/I Subset           Reference              mers'll Student Text. Form C20-1651" is
      Manual, Form C28-8202                                        intended for the programmer who has
                                                                   experience in commercial applications,.
   There are other IBM publications th~t                           Comparisons between PL/I and       COBOL
perform a tutorial function. These publi-                          (COmmon Business Oriented Language) are
cations and their intended audience are as                         included in this guide.
follows:




RESTRICTED DISTRIBUTION: This publication may not be               dis-
tributed without the approval of local IBM management.




   This publication q  Form Y33-6003-0.        makes     obsolete the
previous edition, Form C28-6571-4.

In addition to language changes and new language features,
much of the material has been rewritten and reordered.
Changes and additions to the language are identified by
vertical bars to the left of the text. Language changes that
might affect existing programs are:

 1.   Priority of the concatenation operator

 2.   Conversion   of   character-string    and bit-string data to
      arithmetic

 3.   ALIGNED and PACKED attributes,         including    change       of
      keyword PACKED to UNALIGNED

 4.   The form of the AREA attribute

 5.   The defaults of   REDU~IBLE   and IRREDUCIBLE

 6.   Rounding of E and F format items


A form is provided at the back of this publication for
reader'S comments.  If the form has been removed,     comments
may be addressed to IBM united Kingdom Laboratories Ltd.,
Programming Publications, Hursley Park. Winchester, Hampshire,
England.

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