Compaq COBOL
User Manual

Chapter 11
11	Using ACCEPT and DISPLAY Statements for Input/Output and Video Forms
11.1	Using ACCEPT and DISPLAY for I/O
11.2	Designing Video Forms with ACCEPT and DISPLAY Statement Extensions
11.2.1	Clearing a Screen Area
11.2.2	Horizontal and Vertical Positioning of the Cursor
11.2.3	Assigning Character Attributes to Your Format Entries
11.2.4	Using the CONVERSION Phrase to Display Numeric Data
11.2.5	Handling Data with ACCEPT Options
11.2.5.1	Using CONVERSION with ACCEPT Data
11.2.5.2	Using ON EXCEPTION When Accepting Data with CONVERSION
11.2.5.3	Protecting the Screen
11.2.5.4	Using NO ECHO with ACCEPT Data
11.2.5.5	Assigning Default Values to Data Fields
11.2.6	Using Terminal Keys to Define Special Program Functions
11.2.7	Using the EDITING Phrase
11.3	Designing Video Forms with Screen Section ACCEPT and DISPLAY
11.3.1	Using Screen Section Options
11.3.1.1	Comparison of Screen Section Extensions with Other Extensions of ACCEPT and DISPLAY
Chapter 12
12	Interprogram Communication
12.1	Multiple COBOL Program Run Units
12.1.1	Examples of COBOL Run Units
12.1.2	Calling Procedures
12.2	COBOL Program Attributes
12.2.1	The INITIAL Clause
12.2.2	The EXTERNAL Clause
12.3	Transferring Flow of Control
12.3.1	The CALL Statement
12.3.2	Nesting CALL Statements
12.3.3	The EXIT PROGRAM Statement
12.4	Accessing Another Program's Data Division
12.4.1	The USING Phrase
12.4.2	The Linkage Section
12.5	Communicating with Contained COBOL Programs
12.5.1	The COMMON Clause
12.5.2	The GLOBAL Clause
12.5.2.1	Sharing GLOBAL Data
12.5.2.2	Sharing GLOBAL Files
12.5.2.3	Sharing USE Procedures
12.5.2.4	Sharing Other Resources
12.6	Calling Compaq COBOL Programs from Other Languages
12.6.1	Calling COBOL Programs from C
12.7	Calling Non-COBOL Programs from Compaq COBOL
12.7.1	Calling a Fortran Program
12.7.2	Calling a BASIC Program
12.7.3	Calling a C Program
12.8	Special Considerations for Interprogram Communication
12.8.1	CALL and CANCEL Arguments
12.8.2	Calling OpenVMS Alpha Shareable Images (OpenVMS)
12.8.3	Calling Tru64 UNIX Shareable Objects (Tru64 UNIX)
12.8.4	Case Sensitivity on Tru64 UNIX and Windows NT
12.8.4.1	Linker Case Sensitivity
12.8.4.2	Calling C Programs from Compaq COBOL on Tru64 UNIX and Windows NT
12.8.4.3	Calling COBOL Programs from C on Tru64 UNIX and Windows NT
12.8.5	Additional Information
Chapter 13
13	Using Compaq COBOL in the Alpha Common Language Environment
13.1	Routines, Procedures, and Functions
13.2	The OpenVMS Alpha Calling Standard (OpenVMS)
13.2.1	Register and Stack Usage
13.2.2	Return of the Function Value
13.2.3	The Argument List
13.3	OpenVMS Alpha System Routines (OpenVMS)
13.3.1	OpenVMS Alpha Run-Time Library Routines
13.3.2	System Services
13.4	Calling Routines
13.4.1	Determining the Type of Call (OpenVMS)
13.4.2	Defining the Argument (OpenVMS)
13.4.3	Calling the External Routine (OpenVMS)
13.4.4	Calling System Routines (OpenVMS)
13.4.4.1	System Routine Arguments (OpenVMS)
13.4.4.2	Calling a System Routine in a Function Call (OpenVMS)
13.4.4.3	Calling a System Routine in a Procedure Call (OpenVMS)
13.4.5	Checking the Condition Value (OpenVMS)
13.4.5.1	Library Return Status and Condition Value Symbols (OpenVMS)
13.4.6	Locating the Result (OpenVMS)
13.5	Establishing and Removing User Condition Handlers (OpenVMS)
13.6	Examples (OpenVMS)
Chapter 14
14	Using the REFORMAT Utility
14.1	Running the REFORMAT Utility
14.2	ANSI-to-Terminal Format Conversion
14.3	Terminal-to-ANSI Format Conversion
14.4	REFORMAT Error Messages
Chapter 15
15	Optimizing Your Compaq COBOL Program
15.1	Specifying Optimization on the Compiler Command Line
15.2	Specifying Alignment of Data for Optimum Performance
15.3	Using COMP Data Items for Speed
15.4	Other Ways to Improve the Performance of Operations on Numeric Data
15.4.1	Mixing Scale Factors and Data Types
15.4.2	Limiting Significant Digits
15.4.3	Reducing the Compexity of Arithmetic Expressions
15.4.4	Selection of Data Types (OpenVMS)
15.5	Choices in Procedure Division Statements
15.5.1	Using GO TO DEPENDING ON Instead of IF, GO TO
15.5.2	Using Indexing Instead of Subscripting
15.5.3	Using SEARCH ALL Instead of SEARCH
15.5.4	Selecting Hypersort for Sorting Tasks
15.5.5	Minimizing USE Procedures with LINKAGE SECTION References
15.6	I/O Operations
15.6.1	Using the APPLY Clause
15.6.1.1	Using the PREALLOCATION Phrase of the APPLY Clause
15.6.1.2	Using the EXTENSION Phrase of the APPLY Clause
15.6.1.3	Using the DEFERRED-WRITE Phrase of the APPLY Clause
15.6.1.4	Using the FILL-SIZE ON Phrase of the APPLY Clause
15.6.1.5	Using the WINDOW Phrase of the APPLY Clause
15.6.2	Using Multiple Buffers
15.6.3	Sharing Record Areas
15.6.4	Using COMP Unsigned Longword Integers
15.7	Optimizing File Design (OpenVMS)
15.7.1	Sequential Files
15.7.2	Relative Files
15.7.2.1	Maximum Record Number (MRN)
15.7.2.2	Cell Size
15.7.2.3	Bucket Size
15.7.2.4	File Size
15.7.3	Indexed Files
15.7.3.1	Optimizing Indexed File I/O
15.7.3.2	Calculating Key Index Levels
15.7.3.3	Caching Index Roots
15.8	Image Activation Optimization (Tru64 UNIX)