Question

The Stanford iOS dev seminar suggests I uses “the normal BSD Unix C” library for calculating sine and cosine. While I can calculate those values on my own just fine, I’m trying to learn more about implementing external libraries.

Where is this library? Is it included by default?

Cheers!

Answer 1

I believe they’re just talking about the sin and cos functions included in the standard math.h header. You can simply add

#import <math.h>

to the top of your implementation file, then call sin and cos (with radian arguments). See this reference for function definitions.

Edit: Apparently, the default Foundation import includes math.h, so the #import above isn’t necessary. I’m only leaving it here for future reference.