#if check (preprocessor macro) to differentiate between iPhone and iPad

Question

Is there a build preprocessor macro I can check, with #if or #ifdef to determine if my current Xcode project is being built for iPhone or iPad?

EDIT

As several answers have pointed out, often apps are universal, and the same binary can run on both devices. Conditional behavior between these very similar devices should be solved at runtime rather than compile time.

Answer 1

Some ideas in the comment section of this blog

http://greensopinion.blogspot.com/2010/04/from-iphone-to-ipad-creating-universal.html

Mostly using

UI_USER_INTERFACE_IDIOM()

Such as:

#ifdef UI_USER_INTERFACE_IDIOM()
  #define IS_IPAD() (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#else
  #define IS_IPAD() (false)
#endif