Is there a good reference somewhere with all the C functions that can be used by default in iPhone development (I guess they lie in the Foundation framework)? I mean functions like: arc4random(), cos(), sinf(), hypot(), sqrt(), sqrtf() etc...
They are so many considering their variations too (sin(), sinf()) and googling every single time is ineffective.
Thanks :)
XCode/Help/Documentation
Then look in the Core Library. You may need to subscribe to one or more documentation sets first. Check that you search is not limited to Objective-C also.
If you're looking for all of the math functions, they can be found in the header file
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk/usr/include/math.h
For more generic functions, in addition to the documentation, I often find it helpful to right-(or Control-)click on a function in my code and choose "Jump to Definition". This takes you to the related header, which might also have similar functions and constants.
The Apple iPhone OS Man Pages doc is the handiest guide for this kind of thing.
http://developer.apple.com/iphone/library/documentation/System/Conceptual/ManPages%5FiPhoneOS/
Unfortunately being HeaderDoc driven, there's no PDF version. I thought at one point Apple indexed these symbols in the Xcode docset API indexes, but they don't seem to be there now.
Good luck!