Programming in Objective-C (4th Edition) by Kochan Stephen G

Author:Kochan, Stephen G. [Kochan, Stephen G.]
Language: eng
Format: epub, pdf
Publisher: Pearson Education (US)
Published: 2011-11-27T16:00:00+00:00

return 2.0 * 3.141592654; * r;

after the preprocessor had made its substitution, which would result in a syntax error. Remember not to put a semicolon at the end of your define statements unless you’re really sure you want one there.

A preprocessor definition does not have to be a valid Objective-C expression in its own right, as long as the resulting expression is valid wherever it is used. For instance, you could set up these definitions:

#define AND &&

#define OR ||

Then you could write expressions such as

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