Course Description (By Curriculum)

Using REXX to Build a Structured Program

Duration

2 hours

Overview

Audience

Programmers who require more advanced REXX programming skills

Prerequisites

Completion of the Programming in REXX course or knowledge of REXX programming fundamentals

Objectives

After completing this course, the student will be able to identify:
• How a structured REXX program is written, including the BLK_INIT, BLK_CALC and BLK_SHOW procedures
• How error messages are added

Course Content

Writing a Structured REXX Program

BLKSIZE Calculator as an Example Program
Structure of BLKSIZE EXEC and Parameters
Calculating Variables and Constants
Finished Program

BLK_INIT Procedure

Subroutine BLK_INIT
Validate Input Parameters
Coding the Parameters
Return Codes

BLK_CALC Procedure

How BLKSIZE is Calculated
Arithmetic Functions

BLK_SHOW Procedure

SAY Keyword
Formatting Displays
End/ Return Statement

Adding Error Messages

Setting Up Error Codes
Select and Alternate Actions


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