HP OpenVMS Systems Documentation
For additional information about HP OpenVMS products and services, visit the following World Wide Web address:
The following product names may appear in this manual:
All three names---the longer form and the two abbreviated forms---refer to the version of the OpenVMS operating system that runs on the Intel® Itanium® architecture.
The following table lists the conventions used in this manual:
The following table shows certain references and their respective meanings in this manual:
|Alpha||OpenVMS Alpha or Tru64 UNIX Alpha operating system|
|OpenVMS||OpenVMS Alpha, OpenVMS I64, or OpenVMS VAX operating system|
|Tru64 UNIX||Tru64 UNIX Alpha operating system|
|VAX||OpenVMS VAX operating system|
Tru64 UNIX was formerly known as DEC OSF/1 or as DIGITAL UNIX. HP COBOL was formerly known as Compaq COBOL, DIGITAL COBOL, or DEC COBOL. HP COBOL for OpenVMS VAX was formerly known as Compaq COBOL for OpenVMS VAX, VAX COBOL or as DIGITAL VAX COBOL.
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 COBOL 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 therewith.
The authors and copyright holders of the copyrighted material used herein are as follows: FLOW-MATIC (trademark of Unisys Corporation), Programming for the UNIVAC (R) I and II, Data Automation Systems, copyrighted 1958, 1959, by Unisys Corporation; IBM Commercial Translator Form No. F28-8013, copyrighted 1959 by IBM; FACT, DSI 27A5260-2760, copyrighted 1960 by Minneapolis-Honeywell.
They 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.
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HP welcomes your comments on this manual. Please send comments to either of the following addresses:
OSSG Documentation Group, ZKO3-4/U08
110 Spit Brook Rd.
Nashua, NH 03062-2698
The COBOL language consists of the following components:
A separately compiled COBOL program is a program that, together with its contained programs (if present), is compiled separately from all other programs. Each COBOL program is divided into four parts, called divisions: the Identification Division, Environment Division, Data Division, and Procedure Division. Divisions can contain sections, which in turn can contain paragraphs. Paragraphs can contain sentences, clauses, statements, or entries.
The building blocks of these language components include the COBOL character set, character-strings, separators, punctuation, and literals.
A COBOL program is a string of characters that is syntactically
correct according to the COBOL language rules.
1.1 The COBOL Character Set
The COBOL character set, shown in Table 1-1, is used to form character-strings and separators.
The only components of a COBOL program that can contain characters outside this set are nonnumeric literals, comment-entries, and comment lines. Appendix B specifies the more inclusive computer character sets these elements can use.
|0, 1, ..., 9||digit|
|A, B, ..., Z||letter|
|a, b, ..., z||lowercase letter (equivalent to letter)|
|-||minus sign (hyphen)|
|/||slash (stroke, virgule)|
|>||greater than symbol|
|<||less than symbol|
|,||comma (decimal point)|
|.||period (decimal point, full stop)|
|"||quotation mark (double quotation mark)|
|'||apostrophe (single quotation mark)|
|«||double left-angle brackets|
|»||double right-angle brackets|
Except in nonnumeric literals, the compiler treats lowercase letters as if they were uppercase. Therefore, a program can contain COBOL words without regard to case.1 For example, the compiler recognizes the COBOL words in each of the following pairs as identical:
WORKING-STORAGE Working-Storage Input input file-a FILE-A INSPECT InSpect
1 On Tru64 UNIX the case sensitivity of the system affects COBOL's case insensitivity in a few situations. See the Section 3.1.1 paragraph in Chapter 3, and the section on Section 6.8.4 in Chapter 6. Also refer to the HP COBOL User Manual for a description of the -names lowercase, -names uppercase, and -names as_is flags.