The (...) is an Objective-C directive, which is also used to define the aliases for various data types similar to (...). But (...) is limited to giving symbolic names to types only, whereas (...) can be used to define alias for values as well, like you can define 1 as ONE, etc.

In Objective-C, sometime, you may find that you wish to extend an existing class by adding behavior that is useful only in certain situations. In order to add such extension to existing classes, Objective-C provides ...

Which one contain an INCORRECT way to declare and initialize an array ?

Most proper answer to load plist file contents into an array?

Property attribute that synthesizes only a getter for the property?

How do you search an object in an object array?

What class method is used to make an NSArray from NSData class?

What do you use for an outgoing TCP connection?

Which method, if defined, is guaranteed to be called once -- and only once -- when a class is first referenced?

If you wanted to override the default alloc method in a class Foo, what would be the appropriate way to declare it?

How do you convert a Core Image color to a UIColor?