May 2014
Beginner
186 pages
9h
English
Content preview from Computer Science
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Computer Science
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Figure 5.6 A typical piece of bar-coding which can be used to place computer
data in coded form on paper. Dot-matrix printers can reproduce bar-codes, and
light-pens can be used to read the codes
and it is also possible, using a controlling program, to print bar codes with an
ordinary dot-matrix printer. One very common use of bar codes is to identify
stock items, and their use for this purpose is common in shops.
The reading of bar codes was originally carried out by a form of light-pen
which was moved across the coded bars. By detecting the reflected light, the
presence and width of eac ...
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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.