REXX Programming II for VSE

Duration

2 hours

Overview

Audience

Programmers who require more advanced REXX programming skills.

Prerequisites

Completion of the Programming in REXX I course and knowledge of the fundamentals of REXX programming.

Objectives

After completing this course, the student will be able to identify:
• How to write a structured REXX program, 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

The BLK_INIT Procedure

Subroutine BLK_INIT
Validate Input Parameters
Coding the Parameters
Return Codes

The BLK_CALC Procedure

How BLKSIZE Is Calculated
Arithmetic Functions

The BLK_SHOW Procedure

SAY Keyword
Formatting Displays
End/ Return Statement

Adding Error Messages

Setting Up Error Codes
Select an Alternate Action