All possible NSNumber objCType

Question

What are all the possible NSNumber Objective-C types and what is their meaning?

Looking at the NSNumber Class Reference I found the following:

Your implementation of objCType must return one of “c”, “C”, “s”, “S”, “i”, “I”, “l”, “L”, “q”, “Q”, “f”, and “d”.

Where can I find the meaning of all those types?

Answer 1

According to the Mac Developer Library:

To assist the runtime system, the compiler encodes the return and argument types for each method in a character string and associates the string with the method selector. The coding scheme it uses is also useful in other contexts and so is made publicly available with the @encode() compiler directive. When given a type specification, @encode() returns a string encoding that type. The type can be a basic type such as an int, a pointer, a tagged structure or union, or a class name—any type, in fact, that can be used as an argument to the C sizeof() operator.

You can find their meaning in the following link to: Mac Developer Library