AS/400 RPG编程基础英文教程与语法详解

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RPG编程的英文资料是一份针对AS/400平台的IBM*ILE*RPG/400编程语言的学习指南，主要聚焦于该语言的基础语法和命令的详细介绍。这份文档发布于1994年6月的第一版，适用于程序版本3 Release 0的第5次修改及后续所有未明确指出更新版本。用户在使用前应确保其与产品的当前版本相匹配，因为不同的产品级别可能需要不同的RPG语言支持。资料的重要提示部分提醒读者在使用之前务必阅读“Notices”部分，这可能包含关于兼容性、安全注意事项、版权声明等内容，以确保操作符合规定和最佳实践。获取该出版物的方式是通过联系IBM的代表或当地分支，而非直接从提供的地址获取，因为它们可能不储存库存。文档还提供了一个读者反馈机制，读者可以在背面的读者评论表单上分享他们的观点，或者通过邮件（通过RCFCoordinator）、传真或电子方式向IBM提出问题或建议。这体现了IBM对于用户参与和持续改进的重视，以及他们鼓励开放交流，以便不断优化产品和服务。 RPG语言是专门为IBM AS/400系列系统设计的一种高级编程语言，它结合了过程化和命令式编程风格，特别适合处理批处理和数据处理任务。学习材料会详细讲解RPG的变量类型、数据结构、流程控制语句（如IF、DO、LOOP）、函数调用、文件操作以及与操作系统和数据库交互的方法。理解并掌握这些概念对于开发高效、稳定的AS/400应用程序至关重要。这份RPG编程英文资料是RPG开发者和系统管理员不可或缺的参考资料，无论是初次接触RPG的新手，还是希望深入理解语言特性的经验开发者，都能从中获益匪浅。通过理解和应用其中的理论和实践，可以提升在AS/400平台上进行程序设计和维护的能力。

About This Manual

This manual is a reference for the RPG/400* compiler, the Systems Application

Architecture* (SAA*) implementation of the RPG/400 programming language on the

Application System/400* (AS/400*) system.

The topics this manual covers include:



RPG/400 specifications

 RPG/400 indicators

 RPG/400 cycle

 Operation codes

 RPG/400 words with special functions

 Arrays and tables

 Editing numeric fields

 General file considerations

 Double Byte Character Set (DBCS) support.

You may need to refer to other IBM* manuals for more specific information about a

particular topic. The

Publications Guide, GC41-9678

, provides information on all

the manuals in the AS/400* library.

For a list of related publications, see the “Bibliography” on page 445.

Who Should Use This Manual

This manual is intended for readers who, having read the

RPG/400 User’s Guide

SC09-1816 are interested in more specific and more detailed explanations of

RPG/400 code. Some references are made to the System/38 system and its

various products and features. In some instances, special reference is made to

specific publications, but if no such reference is given, the reader should use the

RPG/400 User’s Guide

Before you use this manual, you should be familiar with certain information:

 You should know how to use data management support, which allows an appli-

cation to work with files. This information is contained in

Data Management

Guide, SC41-9658

The manual includes information on:

– Fundamental structure and concepts of data management support on the

system

– Data management support for display stations, printers, tapes, and

diskettes, as well as spooling support

– Overrides and file redirection (temporarily making changes to files when an

application is run)

– Copying files by using system commands to copy data from one place to

another

– Tailoring a system using double-byte data.

 Copyright IBM Corp. 1994 xvii

.F/ File description specifications define all files in the program. Refer to

Chapter 5, “File Description Specifications” for a description of the entries on

this specification.

.E/ Extension specifications describe all arrays and tables and indicate how they

are initialized. Refer to Chapter 6, “Extension Specifications” for a

description of the entries on this specification.

.L/ Line counter specifications indicate the length of the overflow lines and the

forms length to be printed on each page for each printer file in the program.

Refer to Chapter 7, “Line Counter Specifications” for a description of the

entries on this specification.

.I/ Input specifications describe data structures, named constants, records, and

fields in the input files and indicate how the records and fields are used by

the program. Refer to Chapter 8, “Input Specifications” for a description of

the entries on this specification.

.C/ Calculation specifications describe calculations to be done by the program

and indicate the order in which they are done. Calculation specifications can

control certain input and output operations. Refer to Chapter 9, “Calculation

Specifications” for a description of the entries on this specification.

.O/ Output specifications describe the records and fields and indicate when they

are to be written by the program. Refer to Chapter 10, “Output

Specifications” for a description of the entries on this specification.

The

RPG/400 language is a position-dependent language. Each entry must start in

a specific column. To represent this, each illustration of RPG/400 code will be in

listing format with a scale drawn across the top. You may find it helpful to use your

RPG/400 Debugging Template (GX21-9129).

This reference contains a detailed description of the individual

RPG/400 specifica-

tions. Each field and its possible entries are described. Chapter 11, “Operation

Codes” describes the operation codes that are coded on the Calculation specifica-

tion, which is described in Chapter 9, “Calculation Specifications.”

In addition, there is information on indicators, the logic cycle, arrays and tables, edit

codes and edit words, file translation, multifile processing, and match fields.

Directives

The compiler directive statements /TITLE, /EJECT, /SPACE, and /COPY allow you to

specify heading information for the compiler listing, to control the spacing of the

compiler listing, and to insert records from other file members during a compile.

The compiler directive statements must precede any arrays, tables, translation

records, and alternate collating sequence records (that is, ** records).

/TITLE (Positions 7-12)

Use the compiler directive /TITLE to specify heading information (such as security

classification or titles) that is to appear at the top of each page of the compiler

listing. The following entries are used for /TITLE:

Positions Entry

7-12 /TITLE

13 Blank

14-74 Title information

2 RPG/400 Reference

A program can contain more than one /TITLE statement. Each /TITLE statement

provides heading information for the compiler listing until another /TITLE statement

is encountered. A /TITLE statement must be the first RPG/400 specification

encountered to print information on the first page of the compiler listing. The

information specified by the /TITLE statement is printed in addition to compiler

heading information.

The /TITLE statement causes a skip to the next page before the title is printed. The

/TITLE statement is not printed on the compiler listing.

/EJECT (Positions 7-12)

Enter /EJECT in positions 7 through 12 to indicate that subsequent specifications

are to begin on a new page of the compiler listing. Positions 13 through 74 of the

/EJECT statement must be blank. /EJECT is not printed on the compiler listing.

/SPACE (Positions 7-12)

Use the compiler directive /SPACE to control line spacing within the compiler listing.

The following entries are used for /SPACE:

Positions Entry

7-12 /SPACE

13 Blank

14-16 A positive integer value from 1 through 112 that defines the number

of lines to space on the compiler listing. The number must be left-

adjusted.

If the number specified in positions 14 through 16 is greater than the number of

lines remaining on the current page, subsequent specifications begin on a new

page.

/SPACE is not printed on the compiler listing, but is replaced by the specified line

spacing. The line spacing caused by /SPACE is in addition to the two lines that are

skipped between specification types. If position 6 is blank, it is considered to be

equal to the preceding specification and the two lines are not skipped.

/COPY (Positions 7-11)

The /COPY compiler directive causes records from other files to be inserted, at the

point where the /COPY occurs, with the file being compiled. The inserted files may

contain any valid specification except /COPY.

The /COPY statement is entered in the following way:

Positions Entry

7-11 /COPY

12 Blank

13-44 Identifies the location of the member to be copied (merged). The

format is:

libraryname/filename,membername (

RPG/400 AS/400 environment)

filename.libraryname,membername (RPG III System/38 environment)

 A member name must be specified.

 If a file name is not specified, QRPGSRC is assumed.

 If a library is not specified, the library list is searched for the file.

All occurrences of the specified source file in the library list are

Chapter 1. Introduction to RPG/400 3

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