iTS 1.0+)

Introduction to SCREEN COBOL

Compaq NonStop™ Pathway/iTS SCREEN COBOL Reference Manual—426750-001

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Designing Program Logic

For further information about SCUP and how to use it, refer to the Compaq NonStop™

Pathway/iTS SCUP Reference Manual.

Designing Program Logic

Designing a transaction processing application involves designing SCREEN COBOL

requester programs and servers and partitioning the workload between them. Typical

design practices are discussed in the following paragraphs.

Organizing SCREEN COBOL Program Groups

SCREEN COBOL programs are usually organized into groups of simple, related

programs. Each program performs a discrete function and calls other programs

depending on how the Pathway application is designed to process the transactions.

Figure 1-7

illustrates two typical organizations: the menu and chain.

Both organizations are hierarchical with entry to the group through a single program. In

the menu organization, the main menu screen displays a selection of operations, with

any selection resulting in a call to another simple SCREEN COBOL program that

handles one operation.

Figure 1-7. Program Organizations

007CDT .CDD

Menu Organization Chain Organization

PROG-A PROG-B PROG-C

PROG-A

PROG-B

PROG-C