March 2005
Intermediate to advanced
720 pages
17h 35m
English
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Chapter 5. Input and Output
Overview
Input/output, or I/O, is how a program interacts with its environment. Input may come from what a user types in, an input file, or another program. Program output might be written to the display, to an output file, or to a communication mechanism such as a pipe. These are just a few of the possibilities.
Rexx provides a simple-to-use, high-level I/O interface. At the same time, Rexx aims for standardization and portability across platforms. Unfortunately, this latter goal is difficult to achieve—I/O is inherently platform-dependent, because it relies upon the file systems and drivers the operating system provides for data management. These vary by operating system.
This chapter describes the Rexx I/O model at a conceptual level. Then it explores examples and how to code I/O. The last part of the chapter discusses some of the problems that any programming language confronts when trying to standardize I/O across platforms, some of the trade-offs involved, and how this tension has been resolved in Rexx and its many implementations.
Rexx provides an I/O model that is easy to use and as portable as possible. Section II explores the I/O extensions that many versions of Rexx offer for more sophisticated (but less portable) I/O. Chapter 15 illustrates database I/O and how to interface scripts to popular database management systems such as SQL Server, Oracle, DB2, and MySQL.
The Conceptual I/O Model
Rexx views both input and output as streams—a sequence of ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.