Got the following error messages when compiling a few c files in OSX

Mac OS X Objective-C 2.0 runtime library support functions and data structures are implemented in the shared library /usr/lib/libobjc.A.dylib.

NSValue is for wrapping primitive type as an object

Apparently there are a lot of possibility in clever use of addSubView: method of UIView. Need to find out more

A fun idea: why not do something to drive objective-c runtime system using erlang?