January 2000
Beginner to intermediate
128 pages
1h 48m
English
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Expressions
An expression is the basic building block of the language. Anything with a value can be thought of as an expression. Examples include:
5 5+5 $a $a==5 sqrt(9)
By combining many of these basic expressions, you can build larger and more complex expressions.
Note that the echo statement we’ve used in
numerous examples cannot be part of a complex expression because it
does not have a return value. The print statement,
on the other hand, can be used as part of complex expression, as it
does have a return value. In all other respects,
echo and print are
identical—they output data.
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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.