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Tracing Results ................................30
Exercises - Using the TRACE Instruction .......................30
Chapter 4. Controlling the Flow within a program ...................33
Conditional, Looping, and Interrupt Instructions .....................33
Using Conditional Instructions ............................33
IF...THEN...ELSE Instructions ...........................33
Nested IF...THEN...ELSE Instructions ........................34
SELECT WHEN...OTHERWISE...END Instruction....................37
Using Looping Instructions .............................39
Repetitive Loops................................39
Conditional Loops ...............................42
Combining Types of Loops ............................46
Nested DO Loops ...............................46
Using Interrupt Instructions .............................48
EXIT Instruction ................................48
CALL and RETURN Instructions ..........................49
SIGNAL Instruction ...............................50
Chapter 5. Using Functions ............................51
What is a Function? ...............................51
Example of a Function .............................51
Built-In Functions ................................52
Arithmetic Functions ..............................53
Comparison Functions..............................53
Conversion Functions ..............................53
Formatting Functions ..............................54
String Manipulating Functions ...........................54
Miscellaneous Functions .............................55
Testing Input with Built-In Functions.........................55
Chapter 6. Writing Subroutines and Functions.....................57
What are Subroutines and Functions? .........................57
When to Write Subroutines Rather Than Functions ...................57
Writing Subroutines and Functions ..........................58
When to Use Internal Versus External Subroutines or Functions ..............60
Passing Information ..............................60
Receiving Information from a Subroutine or Function ..................66
Subroutines and Functions—Similarities and Differences ..................70
Chapter 7. Manipulating Data ...........................71
Using Compound Variables and Stems ........................71
What Is a Compound Variable? ..........................71
Using Stems .................................72
Parsing Data ..................................73
Parsing Instructions...............................73
More about Parsing into Words ..........................75
Parsing with Patterns ..............................75
Parsing Multiple Strings as Arguments........................78
Chapter 8. Using Commands from a program .....................81
Types of Commands ...............................81
Using Quotations Marks in Commands .......................81
Using Variables in Commands...........................81
Calling Another REXX Program as a Command ....................82
Issuing Commands from a program
..........................82
iv CICS TS for VSE/ESA: REXX Guide