By Michael Coughlan
Starting COBOL for Programmers is a complete, subtle educational and modular talents reference at the COBOL programming language for proven programmers. This publication is for you while you are a developer who would favor to—or must—add COBOL on your repertoire. possibly you know the possibilities provided through the present COBOL abilities predicament, or are operating in a undertaking serious company which keeps legacy COBOL functions. no matter what your state of affairs, starting COBOL for Programmers meets your wishes as a longtime programmer relocating to COBOL.
Beginning COBOL for Programmers comprises complete insurance of ANS eighty five COBOL positive aspects and methods, together with keep an eye on constructions, names, sequential and direct entry documents, information redefinition, string dealing with, decimal mathematics, subprograms, and the document author. the ultimate bankruptcy features a big advent to object-oriented COBOL.
Benefiting from over 100 instance courses, you’ll obtain an in depth advent to the middle and complex good points of the COBOL language and should learn how to follow those via accomplished and sundry workouts. If you've inherited a few legacy COBOL, you’ll be ready to grab the COBOL idioms, comprehend the constructs, and realize what's occurring within the code you’re operating with.
Today’s company software builders will locate that COBOL talents open new—or old—doors, and this broad COBOL reference is the publication that can assist you collect and strengthen your COBOL abilities.
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Extra info for Beginning COBOL for Programmers
Example 3-11. Common Format in Use 01 StudentRec. 05 StudentId 05 StudentName. 10 Forename 10 Surname 05 DateOfBirth. 08 YOB PIC 9(7). PIC X(9). PIC X(12). PIC 9(4). 51 CHAPTER 3 N DATA DECLARATION IN COBOL 08 MOBandDOB. 10 MOB 10 DOB 05 CourseId 05 GPA PIC PIC PIC PIC 99. 99. X(5). 9V99. Summary This chapter provided an introduction to data in COBOL. It introduced the different types of data used, and it showed how you can create and use variable data in the form of elementary data items. The chapter examined the assignment operation and discussed the data-manipulation opportunities afforded by the hierarchical structure of group item data declarations.
All ordinary assignments should use MOVE. 42 CHAPTER 3 N DATA DECLARATION IN COBOL MOVE Syntax The MOVE metalanguage makes the verb seem simple but its operation is complicated by a set of governing rules. The metalanguage for MOVE is as follows: MOVE Source$#il TO Destination$#i… MOVE copies data from the source identifier (or literal) to one or more destination identifiers. The source and destination identifiers can be group or elementary data items. In most programming languages, the data movement in an assignment statement is from right to left.
This is the style I have chosen for this book because I believe it is the best for a printed format. I want to stress, though, that this stylistic scheme is a personal preference. Programmers in other languages may be more used to a different scheme, and as long as the scheme is consistently used, it should present no problem. It is worth mentioning that when you start to work in a programming shop, a naming scheme may be forced on you. So perhaps it is not a bad thing to get some practice fitting in with someone else’s scheme.