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PL/I Structured Programming, by Joan K. Hughes
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A complete course in the PL/I programming language, presented in a simple and logical manner with many features to help the reader grasp the material quickly: checkpoint questions interspersed throughout each chapter; a detailed index to help locate references to technical points and answers to questions; a glossary of terms, and more. Also includes a section on debugging techniques to aid in coding and testing programs, and a case study in each chapter.
- Sales Rank: #1572788 in Books
- Published on: 1986-06-26
- Original language: English
- Number of items: 1
- Dimensions: 9.63" h x 1.18" w x 6.42" l, 1.97 pounds
- Binding: Paperback
- 639 pages
Most helpful customer reviews
7 of 7 people found the following review helpful.
This is the one for PL/I
By Paul Schwartzberg
Robin Vowel's book compliments Hughe's book for a variety of algorithms and none-MVS platforms (emphasizing certain PL/I facilities well).
NB.
Caution with inexpensive used copies. They may not be the latest edtion. Previous editions are more verbose.
3 of 3 people found the following review helpful.
Possible ENVironment Efficiency Problem
By Scrivens
This is indeed an excellent text, much easier to understand than the IBM language reference manual. Years ago I taught PL/I at my workplace and used it (or an earlier edition) as a text. I even wrote Ms. Hughes a letter of appreciation. (Indeed, an earlier Hughes text helped me cross the boundary between the language reference manual and actually understanding and being able to use the language.)
There is one area where I see a problem -- the efficiency of using external storage media.
In IBM MVS systems there are three places where file attributes can be specified: On the associated "label" of an existing file; On a Job Control Language DD statement or TSO ALLOCATE statement; and in the internals of the application.
Ms. Hughes repeatedly uses file Environment statements such as ENV(F RECSIZE(80)). Since the application program has the highest degree of control, overriding both JCL and data set label, the "F" specification will almost certainly force unblocked records on disk or tape. This is grossly inefficient both in I/O speed and amount of disk storage taken for a specified number of records.
The more correct specification is ENV(FB RECSIZE(80)). This DOES NOT prevent using unblocked records since an external BLKSIZE(80) specification would have that result but it does permit the highly desirable and efficient Fixed-Blocked data format (i.e. multiple, often many records per physical block on disk or tape).
The PL/I application DOES NOT need to know what the blocksize is, as in the above case the data management access method routines will present successive 80-byte records to the application, regardless of blocksize.
Even if for some computing platforms ENV(F ...) is required, Ms. Hughes should have inserted a cautionary note. As I have demonstrated at times to my user community, the difference in time and space usage between blocked and unblocked records is very dramatic.
9 of 9 people found the following review helpful.
An excellent manual and tutorial for PL/I programming
By A Customer
I needed a reference manual for PL/I and decided to go for this book. It is very good if you are new to the language or are trying to remember what a particular function does. It even has separate sections at the back of the book for ASCII and EBCDIC tables, how the different PL/I data formats are stored in records, and a good summary at the back showing which functions are supported by the various PL/I compilers and subsets. It is not a the cheapest (hardback) book on PL/I but is well worth the investment.
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