April 1994
Beginner
432 pages
6h 37m
English
Content preview from Absolute Beginner’s Guide to C, 2nd Edition
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7. What Do #include and #define Mean?
They’re Preprocessor Directives
Two types of lines you see in many C programs are not C commands at all. They are preprocessor directives. A preprocessor directive always begins with a pound sign (#). Preprocessor directives don’t cause anything to happen at runtime (when you run your program). Instead, they do work during the compiling of your program.
The most often-used preprocessor directives are
• #include
• #define
In earlier chapters, you saw examples that used #include. This chapter finally takes the ...
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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.
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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.