Titlebook: Beginning COBOL for Programmers; Michael Coughlan Book 2014 Michael Coughlan 2014

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Control Structures: Selection,The last chapter noted that programs that consist only of a sequence of statements are not very useful. To be useful, a program must use selection constructs to execute some statements rather than others and must use iteration constructs to execute certain statements repeatedly.

Salivary-Gland

Control Structures: Iteration,The previous chapter dealt with COBOL’s selection constructs: . and .. In this chapter, you examine the last of the classic structured programming constructs: iteration.

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分解

憤世嫉俗者

Processing Sequential Files,Previous chapters introduced the mechanics of creating and reading sequential files. This chapter introduces the two most important sequential-file processing problems: control breaks and the file update problem.

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Advanced Data Declaration,In the last chapter, you learned how to create and use a one-dimensional prefilled table. In this chapter, I continue the discussion of the . clause and demonstrate how you can use it to create a two-dimensional prefilled table.