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Contents
Preface ....................................xix
What this book is about ..............................xix
Who this book is for ...............................xix
What you need to know to understand this book .....................xix
Prerequisites .................................xix
Part 1. User's Guide..............................1
Chapter 1. Introduction ..............................3
What is REXX?..................................3
Features of REXX.................................3
Ease of use ..................................3
Free format ..................................3
Convenient built-in functions ............................3
Debugging capabilities ..............................3
Interpreted language...............................3
Extensive parsing capabilities ...........................3
Components of REXX ...............................4
Chapter 2. Writing and Running a REXX Program ....................5
What you need to run a REXX Program? ........................5
What is a REXX Program? .............................5
Syntax of REXX Instructions .............................6
The Format of REXX Instructions ..........................6
The Letter Case of REXX Instructions ........................6
Types of REXX Clauses .............................9
Programs Using Double-Byte Character Set Names....................10
Typing in a Program ...............................11
Running a Program...............................11
Interpreting Error Messages ............................12
How to Prevent Translation to Uppercase .......................13
Characters within a program ...........................13
Characters Input to a program...........................14
Exercises - Running and Modifying the Example Programs ................14
Passing Information to a program ..........................14
Getting Information from the Program Stack or Terminal Input Device ............14
Specifying Values When Calling a program ......................15
Preventing Translation of Input to Uppercase .....................16
Passing Arguments ...............................17
Chapter 3. Using Variables and Expressions .....................19
Program Variables ................................19
Using Variables .................................19
Variable Names ................................19
Variable Values ................................20
Using Expressions ................................21
Arithmetic Operators ..............................21
Comparison Operators .............................23
Logical (Boolean) Operators ...........................25
Concatenation Operators.............................27
Priority of Operators ..............................28
Tracing Expressions with the TRACE Instruction .....................29
Tracing Operations ...............................29
© Copyright IBM Corp. 1992, 2009 iii