Edited Numeric Format Description and Discussion |
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This document will focus on the discussion of an edited numeric format (or using an edit mask) that is typically used by COBOL programmers that maintain or support Mainframe applications. The edited numeric format is typically used to prepare or convert numeric data that is stored in a variety of formats into a format that is easily read by human beings or easily exported to a non-Mainframe or non-COBOL environment such as an Excel spreadsheet running on a Windows platform.
Note: The items in this document are appropriate for applications that are written in COBOL, Mainframe Assembler (HLASM) or PL/I. The IBM Mainframe architecture drove many of the numeric formats that existed in the early ANSI specifications for COBOL and have been carried forward to the current COBOL ANSI specifications.
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The following table shows the conversion of Zoned-Decimal (USAGE IS DISPLAY), Binary (USAGE IS COMP) and Packed-Decimal (USAGE IS COMP-3) fields with various values to a human readable field for printing or displaying. The edited field (or result field) will have the leading zeroes suppressed and contain an explicit decimal point. The trailing sign is a separate character. Since the edit mask contains a "-" (or minus sign) the sign will only print for negative numbers as a "-" or minus sign. The plus sign is a space character. If the value of the input field is greater than 999.99 then commas will be inserted and printed or displayed.
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The following sections will show snippets of COBOL code that may be used to edit (prepare or convert) the various numeric formats for printing or displaying. The technique used for the Binary, Packed-Decimal and Zoned-Decimal is the same.
The following shows sample COBOL source code for preparing a binary field to be printed or displayed.
WORKING-STORAGE SECTION. ... 01 BINARY-FIELD PIC S9(5)V(2) USAGE IS COMP. * 01 EDIT-DROP-LEAD-ZEROES PIC ZZ,ZZZ.99-. ... PROCEDURE DIVISION. * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * truncate the decimal positions without rounding. move BINARY-FIELD to EDIT-DROP-LEAD-ZEROES * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * do the proper rounding. add BINARY-FIELD to ZERO giving EDIT-DROP-LEAD-ZEROES ROUNDED
The following shows sample COBOL source code for preparing a packed-decimal field to be printed or displayed.
WORKING-STORAGE SECTION. ... 01 PACKED-DECIMAL-FIELD PIC S9(5)V(2) USAGE IS COMP-3. * 01 EDIT-DROP-LEAD-ZEROES PIC ZZ,ZZZ.99-. ... PROCEDURE DIVISION. * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * truncate the decimal positions without rounding. move PACKED-DECIMAL-FIELD to EDIT-DROP-LEAD-ZEROES * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * do the proper rounding. add PACKED-DECIMAL-FIELD to ZERO giving EDIT-DROP-LEAD-ZEROES ROUNDED
The following shows sample COBOL source code for preparing a zoned-decimal field to be printed or displayed.
WORKING-STORAGE SECTION. ... 01 ZONED-DECIMAL-FIELD PIC S9(5)V(2) USAGE IS COMP-3. * 01 EDIT-DROP-LEAD-ZEROES PIC ZZ,ZZZ.99-. ... PROCEDURE DIVISION. * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * truncate the decimal positions without rounding. move ZONED-DECIMAL-FIELD to EDIT-DROP-LEAD-ZEROES * If the PACKED-DECIMAL-FIELD had more decimal positions * than the EDIT-WITH-BLANK-FILL field then the following would * do the proper rounding. add ZONED-DECIMAL-FIELD to ZERO giving EDIT-DROP-LEAD-ZEROES ROUNDED
The following table show the conversion of Zoned-Decimal (USAGE IS DISPLAY), Binary (USAGE IS COMP) and Packed-Decimal (USAGE IS COMP-3) fields with various values to a text field for exporting.
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This section describes possible situations that may need special consideration and may take additional time to properly address.
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Possibilities and Considerations |
The purpose of this document is to provide information about an edited numeric format that is typically used to prepare or convert numeric data that is stored in a variety of formats into a format that is easily read by human beings or may be exported to a non-mainframe environment such as an excel spreadsheet running in a Windows environment. Also, this document may be used to assist as a tutorial for new programmers or as a quick reference for experienced programmers.
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Explore The Binary or COMP format for numeric data strings. This numeric structure is supported by COBOL and may be explicitly defined with the "USAGE IS COMP" or "USAGE IS BINARY" clause.
Explore The Edited for Display format for numeric data strings. This numeric structure is supported by COBOL and may be used with an edit-mask to prepare the presentation for readability by human beings.
Explore The Packed-Decimal or COMP-3 format for numeric data strings. This numeric structure is supported by COBOL and may be explicitly defined with the "USAGE IS COMP-3" clause.
Explore The Zoned-Decimal format for numeric data strings. This numeric structure is the default numeric for COBOL and may be explicitly defined with the "USAGE IS DISPLAY" clause.
Explore commonly used formats and processing techniques for managing various numeric formats available on the mainframe.
Explore the Numbers Connection for additional information about the structure and processing of numeric data items (or numeric fields).
Explore the SS Format of the Edit and Mark Instruction. The assembler program is written to comply with an Assembler/H or HLASM Mainframe Assembler dialect. A JCL member is provided as a job script to run as a batch job on an IBM Mainframe System with ZOS or a Windows System with Micro Focus Enterprise Developer.
Explore a COBOL Replacement of an HLASM Program that uses the IBM 360 EDMK Instruction. The COBOL program is written to comply with ANSI/2002. A JCL member is provided as a job script to run as a batch job on an IBM Mainframe System with ZOS or a Windows System with Micro Focus Enterprise Developer.
Explore How to Generate a Data File Convert Program using simple specification statements in a Process Control File (PCF). This link to the User Guide includes the information necessary to create a Process Control File and generate the COBOL programs that will do the actual data file conversion. The User Guide contains a list of the PCF statements that are used for the data file convert process.
Explore a typical data file conversion process that may be required when working in a multi-system environment. This suite of documents describes a model for managing non-relational data structures (Sequential Files and VSAM Data Sets) that contain ASCII or EBCDIC text strings and various numeric formats such as BINARY, PACKED-Decimal and ZONED-Decimal. This model has the capability of creating a test file for an ASCII or EBCDIC encoded environment. This suite of documents will address many of the challenges of doing a record content conversion of a file that will be transferred between an EBCDIC-encoded Mainframe System and an ASCII-encoded Linux, UNIX or Windows System.
Explore The ASCII and EBCDIC Translation Tables. These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.
Explore The File Status Return Codes that are used to interpret the results of accessing VSAM data sets and/or QSAM files.
The following links will require an internet connect.
A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. This link requires an Internet Connection
Explore The Micro Focus Web Site for more information about products (including Micro Focus COBOL) and services available from Micro Focus. This link requires an Internet Connection.
Explore the GnuCOBOL Technologies available from SourceForge. SourceForge is an Open Source community resource dedicated to helping open source projects be as successful as possible. GnuCOBOL (formerly OpenCOBOL) is a COBOL compiler with run time support. The compiler (cobc) translates COBOL source to executable using intermediate C, designated C compiler and linker. This link will require an Internet Connection.
Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.
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