December 2013
Beginner
576 pages
16h 4m
English
Content preview from Programming in Objective-C, Sixth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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More Advanced Types of Definitions
A definition for a name can include more than a simple constant value. It can include an expression and, as you will see shortly, just about anything else!
The following defines the name TWO_PI as the product of 2.0 and 3.141592654:
#define TWO_PI 2.0 * 3.141592654
You can subsequently use this defined name anywhere in a program where the expression 2.0 * 3.141592654 would be valid. So, you could replace the return statement of the circumference method from the previous example with the following statement:
return TWO_PI * radius;
Whenever a defined name is encountered in an Objective-C program, everything that appears to the right of the defined name in the #define statement is ...
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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.
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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.