By Michael Coughlan
Starting COBOL for Programmers is a complete, refined educational and modular abilities reference at the COBOL programming language for validated programmers. This e-book is for you while you're a developer who would prefer to—or must—add COBOL on your repertoire. maybe you know the possibilities awarded by way of the present COBOL talents situation, or are operating in a challenge severe firm which keeps legacy COBOL purposes. 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 contains entire insurance of ANS eighty five COBOL gains and methods, together with regulate constructions, names, sequential and direct entry records, information redefinition, string dealing with, decimal mathematics, subprograms, and the record author. the ultimate bankruptcy contains a big creation to object-oriented COBOL.
Benefiting from over 100 instance courses, you’ll obtain an in depth creation to the center and complicated positive factors of the COBOL language and may learn how to practice those via accomplished and sundry workouts. If you've inherited a few legacy COBOL, you’ll have the ability to grab the COBOL idioms, comprehend the constructs, and realize what's taking place within the code you’re operating with.
Today’s company software builders will locate that COBOL talents open new—or old—doors, and this huge COBOL reference is the publication that can assist you collect and improve your COBOL talents.
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Assignment might create more of a hiccup, but there is nothing too radical even in that. The real difference between COBOL and these other languages lies in how data is declared. This chapter explores the different categories of data used in COBOL. It demonstrates how you can create and use items of each category. Because COBOL’s approach to data declaration affects assignment in COBOL, that topic is also examined in this chapter. Categories of Program Data COBOL programs basically use three categories of data: u Literals u Figurative constants u Data items (variables) Unlike other programming languages, COBOL does not support user-defined constants.
Once you have done this, the StudentRec area of storage is instantiated with the data as shown in Example 3-5. Example 3-5. StudentRec as an Elementary Data Item WORKING-STORAGE SECTION. 01 StudentRec PIC X(44). StudentRec 1 2 0 5 6 2 1 W I l l i a m F i t z p a t r i c k 1 9 7 5 1 0 2 1 L M 0 5 1 3 8 5 You can see that the data in StudentRec consists of a number of pieces of information: the student’s ID, the student’s name, the date of birth, the course ID, and the student’s grade point average (GPA).
Declaring Elementary Data Items In typed languages, the data type specified is important because the type determines the range of values that the item can store and governs the operations that can be applied to it. For instance, a Java int data item can store values between -2,147,483,648 and 2,147,483,647 and can only be used in operations that expect an operand of that, or a compatible, type. From the type of the item, the compiler can establish how much memory to set aside for storing its values.