IBM SC34-5764-01 manuali

Ibm SC34-5764-01 Manuale Utente (481 pagine)

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Indice

R EXX Guide

Contents

Contents v

Contents vii

Contents ix

Contents xi

Contents xiii

Contents xv

Contents xvii

What this book is about

Who this book is for

Prerequisites

Part 1. User's Guide

Chapter 1. Introduction

Components of REXX

What is a REXX Program?

Syntax of REXX Instructions

Ending an instruction

Continuing an instruction

Types of REXX Clauses

Null Clause

Typing in a Program

Running a Program

Interpreting Error Messages

Characters within a program

Characters Input to a program

Specifying Too Few Values

Specifying Too Many Values

Passing Arguments

Program Variables

Using Variables

Variable Names

Variable Values

Using Expressions

Order of Evaluation

Comparison Operators

Using Comparison Expressions

Logical (Boolean) Operators

Using Logical Expressions

Concatenation Operators

Priority of Operators

Tracing Operations

Tracing Results

IF...THEN...ELSE Instructions

Control Flow within a Program

Tr ueFalse

Using Looping Instructions

Repetitive Loops

Infinite Loops

DO FOREVER Loops

LEAVE Instruction

ITERATE Instruction

Conditional Loops

DO WHILE

DO UNTIL

Combining Types of Loops

Nested DO Loops

Exercises - Combining Loops

Using Interrupt Instructions

EXIT Instruction

CALL and RETURN Instructions

SIGNAL Instruction

Chapter 5. Using Functions

Built-In Functions

Arithmetic Functions

Comparison Functions

Conversion Functions

Formatting Functions

String Manipulating Functions

Miscellaneous Functions

Using Functions

Passing Information

ARG arg1, arg2, arg3,

Exercise - Writing a Function

Chapter 7. Manipulating Data

Using Stems

Parsing Data

Parsing Instructions

ARG Instruction

PARSE VAR Instruction

More about Parsing into Words

Parsing with Patterns

Variable

Manipulating Data

100

Types of Commands

103

Using Variables in Commands

103

Using Commands from a Program

104

Debugging Programs

107

Starting Interactive Debug

108

Ending Interactive Debug

109

Consider the Data

111

Test Yourself

111

Happy Hour

112

Designing a Program

114

Methods for Designing Loops

115

The Conclusion

115

What Do We Have So Far?

116

Reconsider the Data

117

Correcting Your Program

117

Modifying Your Program

117

Tracing Your Program

117

Coding Style

118

Part 2. Reference

123

Chapter 11. Introduction

125

Introduction

126

SQL Interface

128

Structure and General Syntax

131

Characters

132

Comments

132

REXX General Concepts

133

Implied Semicolons

136

Continuations

137

Expressions and Operators

137

Expressions

137

Operators

137

String Concatenation

138

Arithmetic

138

Comparison

139

Logical (Boolean)

140

Assignments and Symbols

143

Constant Symbols

143

Simple Symbols

144

Compound Symbols

144

Environment

146

Commands

146

REXX Exec Invocation

147

Where Execs Execute

148

Locating and Loading Execs

148

Editing Execs

148

DBCS Support

151

Miscellaneous Features

151

ADDRESS VALUE expression

153

Simple DO Group

160

Repetitive DO Loops

161

INTERPRET

167

 OPTIONS expression ; 

173

Parse Numeric Var1

175

PARSE VAR string word1 string

175

PROCEDURE

177

 RETURN

183

Example:

184

Prefix Options

189

Numeric Options

190

A Typical Example

190

Format of TRACE Output

190

Chapter 14. Functions

193

Search Order

194

Errors During Execution

195

Built-in Functions

196

ABBREV (Abbreviation)

197

ABS (Absolute Value)

197

ARG (Argument)

197

BITAND (Bit by Bit AND)

198

BITOR (Bit by Bit OR)

199

B2X (Binary to Hexadecimal)

199

CENTER/CENTRE

200

CONDITION

200

C2D (Character to Decimal)

201

DATATYPE

202

Functions

203

DELSTR (Delete String)

205

DELWORD (Delete Word)

205

D2C (Decimal to Character)

205

D2X (Decimal to Hexadecimal)

206

ERRORTEXT

206

EXTERNALS

207

LASTPOS (Last Position)

210

LINESIZE

210

MAX (Maximum)

210

MIN (Minimum)

211

POS (Position)

211

SOURCELINE

213

SUBSTR (Substring)

214

TRANSLATE

217

TRUNC (Truncate)

217

WORDINDEX

220

WORDLENGTH

220

WORDPOS (Word Position)

220

XRANGE (Hexadecimal Range)

220

X2B (Hexadecimal to Binary)

221

X2D (Hexadecimal to Decimal)

221

Chapter 15. Parsing

225

The Period as a Placeholder

226

Chapter 15. Parsing 205

227

Chapter 15. Parsing 207

229

Using UPPER

231

Parsing Instructions Summary

232

Parsing Instructions Examples

232

Advanced Topics in Parsing

233

Parsing Multiple Strings

233

Parsing with DBCS Characters

235

Details of Steps in Parsing

235

Chapter 15. Parsing 215

237

Definition

240

Precision

240

Arithmetic Operators

240

Addition and Subtraction

241

Multiplication

241

Division

242

Basic Operator Examples

242

Integer Division

243

Remainder

243

Additional Operator Examples

243

Numeric Comparisons

244

Exponential Notation

244

Numbers and Arithmetic

245

Numeric Information

246

Whole Numbers

246

Numbers Used Directly by REXX

246

Condition Information

250

Descriptive Strings

250

Special Variables

250

The Special Variable RC

250

The Special Variable SIGL

250

Invocation

253

Screen Format

254

Prefix Commands

254

Individual Line Commands

254

Consecutive Block Commands

255

Destination Commands

255

Command Line Commands

256

BACKWARD

257

Text Editor

258

Return Codes

260

Operands

260

RESERVED

273

POOL1:\USERS\USER1\TEST.EXEC

279

Current Directory and Path

280

Security

281

RFS commands

281

File System

282

File List Utility

286

FLST Commands

287

FLST Return Codes

294

Directories and Lists

295

RLS commands

297

List System

298

Background

303

Highlights

303

Command Definition

304

CICPARMS Control Block

305

Non-REXX Language Interfaces

306

Programming Considerations

307

Embedding SQL Statements

307

DB2 Interface

308

Receiving the Results

309

Example Using SQL Statements

310

Overview

313

REXX/CICS Client Exec Example

314

REXX/CICS Server Exec Example

315

Facility

317

Example of Panel Definition

317

Defining Panels

318

Panel Facility

319

PANEL RUNTIME

324

PANEL Variables

327

System Error Reason Codes

329

State Codes and Input Codes

330

State codes

331

Input codes

331

Location Codes

332

Examples of Sample Panels

332

Example 1

332

Example 2

333

Example 3

333

Example 4

334

Example 5

334

AUTHUSER

342

Examples

343

CONVTMAP

348

DEFTRNID

360

EXECDROP

364

EXECLOAD

368

FILEPOOL

372

LISTCLIB

379

LISTELIB

380

LISTPOOL

381

LISTTRNID

382

SCRNINFO

390

WAITREAD

397

Part 3. Appendixes

399

Error Numbers and Messages

402

Appendix B. Return Codes

409

LISTCLIB and LISTELIB

413

General Description

417

Symbols and Strings

418

Validation

419

Instruction Examples

419

PUSH and QUEUE

420

SAY and TRACE

420

DBCS Function Handling

421

Built-in Function Examples

422

DBCS Processing Functions

426

Counting Option

426

Function Descriptions

426

DBADJUST

426

DBBRACKET

426

DBCENTER

427

DBCJUSTIFY

427

DBRRIGHT

428

DBTODBCS

429

DBTOSBCS

429

DBUNBRACKET

429

DBVALIDATE

430

Reserved Keywords

431

Keywords and Variables

432

Appendix E. Debug Aids

433

Debug Aids

434

Business Solutions

435

Business Value Discussion

436

Product Positioning

437

System Profile Exec

439

Defining Authorized Users

439

Parameters

440

Function IDs

441

Appendix H. Security

443

BMS Example

450

Create the RFS Filepools

453

Install Resource Definitions

453

Update LSRPOOL Definitions

453

Rename supplied Procedures

453

Update CICSTART.PROC

454

Format the RFS Filepools

455

Create the Help Files

455

Verify the Installation

456

PI Configuration

457

Bibliography

459

VSE/ESA Version 2 Release 5

460

Bibliography 439

461

C for VSE/ESA (C/VSE)

462

COBOL for VSE/ESA (COBOL/VSE)

462

DB2 Server for VSE

462

DL/I VSE

463

PL/I for VSE/ESA (PL/I VSE)

463

Trademarks

467

Special characters

469

Index 449

471

Index 451

473

Index 453

475

Sending your comments to IBM

477

SC34-5764-01

480

REXX Guide

481

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IBM SC34-5764-01 manuali

Ibm SC34-5764-01 Manuale Utente (481 pagine)

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