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Micro Focus COBOL (TM) Micro Focus COBOL (TM) Language Reference - Additional Topics Printed in U.S.A. HP Part No. B2433-90048 Edition Fourteenth Edition E1095
(c) Copyright 1995 Hewlett-Packard Company Issue 14 April 1994 Micro Focus has made every effort to ensure that this manual is correct and accurate, but reserves the right to make changes without notice at its sole discretion at any time. The software described in this document is supplied under a license and may be used or copied only in accordance with the terms of such license, and in particular any warranty of fitness of Micro Focus software products for any particular purpose is expressly excluded and in no event will Micro Focus be liable for any consequential loss. COBOL is an industry language and is not the property of any company or group of companies, or of any organization or group of organizations. No warranty, expressed or implied, is made by any contributor or by the CODASYL Programming Language Committee as to the accuracy and functioning of the programming system and language. Moreover, no responsibility is assumed by any contributor, or by the committee, in connection herewith. The authors and copyright holders of the copyrighted material used herein: FLOW-MATIC(TM) Programming for the Univac(R) I and II, Data Automation Systems copyrighted 1958,1959, by Sperry Rand Corporation; IBM(R) Commercial Translator Form No. F28-8013, copyrighted 1959 by IBM(R) FACT, DSI27A5260-2760, copyrighted 1960 by Minneapolis-Honeywell have specifically authorized the use of this material in whole or in part, in the COBOL specifications. Such authorization extends to the reproduction and use of COBOL specifications in programming manuals or similar publications. Micro Focus(R) and Animator(R) are registered trademarks of Micro Focus Limited. Micro Focus COBOL(TM), VS COBOL(TM), LEVEL II COBOL(TM), LEVEL II COBOL/ET(TM), and Professional COBOL(TM) are trademarks of Micro Focus Limited. IBM(R) is a registered trademark of International Business Machines Corporation. Systems Application Architecture(TM) is a trademark of International Business Machines Corporation. Microsoft(R) is a registered trademark of Microsoft Corporation. Data General(R) is a registered trademark of Data General Corporation. PANVALET(TM) and Librarian(TM) are trademarks of Computer Associates. Ryan McFarland(R) is a registered trademark of Ryan-McFarland Corporation. X/Open(R) and UNIX(R) are registered trademarks of X/Open Company Limited. Copyright (c) 1978-1994 Micro Focus Limited All Rights Reserved Printed in U.S.A. Printed October 1995 Preface This manual describes the support for those COBOL language features that are additional to the ANSI COBOL standards X3.23-1985, X3.23a-1989 and X3.23b-1993. These COBOL language extensions are supported by a number of COBOL systems. See your COBOL System Reference for details of your system. Audience This manual is intended for programmers already familiar with the COBOL language. Related Publications Other manuals in your document set which you may need to refer to are the: * Getting Started * COBOL User Guide * COBOL System Reference (two volumes) * Language Reference See below for details. * Error Messages * Compatibility Guide * Pocket Guide The on-disk document Documentation Update Notes on your issue disks (or in your docs directory after installing) may contain updates to these books. Using this Manual This manual describes the support provided for additional language features such as Report Writer, Communication, and DBCS. These features are less commonly used. Your Language Reference should be used as the companion manual to this one. It describes the support provided by Micro Focus for the base COBOL language. We envision you using your Language Reference as your first point of reference. Notation in this Manual Throughout this manual, the following notation is used to describe the format of COBOL statements: 1. Words printed in capital letters which are underlined must always be present when the functions of which they are a part are used. An error will be reported by your COBOL system if the underlined words are absent or incorrectly spelled. The underlining is not necessary when writing a COBOL source program. 2. Words printed in capital letters which are not underlined are used in the COBOL source program for readability only. They may be written, or not, as the programmer wishes, but if written, must be correctly spelled. 3. All words printed in small letters are generic terms representing names which will be devised by the programmer. 4. When material is enclosed in braces { }, a choice must be made from the options within them. 5. When material is enclosed in choice indicators { | | }, one or more of the unique options must be specified, but a single option may be specified only once. 6. When material is enclosed in square brackets [ ] , it is an indication that the material is an option which may be included or omitted as required. 7. When material is enclosed in boxed, square brackets [ ] it is an indication that the material is mandatory for ANSI'74 COBOL (American National Standards Institute publication X3.23-1974) but may be optionally omitted as an extension to that language specification. The symbol adjacent to the box or appearing in the margin indicates the dialects of COBOL in which that material is optional. See rule 10 for further details on dialect features. 8. In text, the ellipsis (...) shows the omission of a portion of a source program or a sequence. This meaning becomes apparent in context. In the General Formats, the ellipsis represents the position at which repetition may occur at the user's option. The portion of the format that may be repeated is determined as follows: Given...in a clause or statement format, scanning right to left, determine the } or ] immediately to the left of the...; continue scanning right to left and determine the logically matching { or [; the...applies to the words between the determined pair of delimiters. 9. This manual presents the syntax of Multivendor Integration Architecture (MIA) - Technical Requirements for the programming language COBOL. No boxes or dialect symbols for MIA are used in this manual. 10. The COBOL language accepted by most COBOL compilers includes extensions to the COBOL language defined in American National Standard X3.23-1974. Different compilers allow different extensions to this standard which means there are different versions, called `dialects', of COBOL. This COBOL product is designed for use in cross-development; it can be used for developing not only programs for use on your COBOL system itself but also programs for use with IBM mainframe compilers such as IBM OS/VS COBOL or IBM VS COBOL II, or programs that conform entirely to ANS X3.23-1974 or its successor ANS X3.23-1985. It allows most extensions that are in the two COBOLs, and all the features from ANS X3.23-1985. To help you keep to the appropriate dialect - that of your target system - this manual shows the dialects in which each feature appears. Features outside ANS X3.23-1974 are labeled thus: (OSVS) These features are extensions to ANS X3.23-1974 that appear in IBM OS/VS COBOL. (VSC2) These features are extensions to ANS X3.23-1985 that appear in IBM VS COBOL II. (COB/370) These features are extensions to ANS X3.23-1985 that are supported in IBM SAA AD/Cycle COBOL/370, but not in IBM VS COBOL II. (ANS85) These features are new features defined in ANS X3.23-1985 which are not supported under ANS X3.23-1974. (XOPEN) These features are extensions to ANS X3.23-1985 that appear in the X/Open CAE Specification, COBOL language (XPG-4). (MF) These features are extensions to ANS X3.23-1985 that are specific to Micro Focus COBOL.
NOTE The Micro Focus, VS COBOL II, COBOL/370, and X/Open dialects are all based on the ANS X3.23-1985 COBOL Standard. Therefore, any syntax (or rules) which are marked as valid for ANS85 are also valid for Micro Focus, VS COBOL II, COBOL/370, and X/Open unless explicitly designated otherwise.
NOTE The COBOL/370 dialect includes all of the syntax included in VS COBOL II which is marked with a VSC2 bubble in this manual. The only time that a COB370 bubble appears in this manual are cases where COBOL370 (with the NOCMPR2 compiler option) includes additional or different text than that included with VS COBOL II (with the NOCMPR2 compiler option).
11. These bubbles reflect support only for a particular syntax and its semantics. You have to use system directives to effect a set of reserved words associated with a particular dialect. See your COBOL System Reference for details on these directives, and the appendix Reserved Words in your Language Reference, and your Compatibility Guide for a list of the reserved words affected by various dialects. Thus, for example, if you are developing a program for use on IBM OS/VS COBOL, you can use the unmarked features plus any marked OSVS; while if developing solely for your COBOL environment you can use any feature. If you supply the FLAG directive when you invoke the system software, your COBOL system software flags any features outside the given dialect. (See your COBOL System Reference for details.) Also see your COBOL System Reference for information on the FLAGAS directive which turns flagging messages into error messages. 12. Some features have different effects in different dialects; you specify a dialect-control directive to select the dialect with which you want compatibility. The boxes around such features are double-ruled. Extra reserved words needed by features outside ANS X3.23-1985 are reserved only when the appropriate dialect-control directive is present; this means you can ensure that the only words reserved in the specified dialect are reserved on your target system. If you use only features that need no extra reserved words, and whose effects are the same in all dialects, you need not specify a dialect-control directive. The dialect-control directive specifying the ANS X3.23-1985 dialect also causes the few ANS 3.23-1974 features not allowed in ANS X3.23-1985 to be flagged with a warning message. (See your COBOL System Reference for details of these dialect-control directives.) 13. The phrase "is documentary only" in the text of this manual means that the associated coding is accepted syntactically by your COBOL system software, but is ignored when producing the object program. 14. The changes for this release are summarized in your Getting Started. 15. Hexadecimal values are enclosed in quotation marks and preceded by a lowercase x for nonnumeric values and by a lowercase h for numeric values; for example, x"9D".