Message Expressions and comments

Like C and C++ objective-C provides comments. Programmer can use single or multi line comments in the code according to the need. Message expressions are enclosed in square brackets.

Message Expressions in Objective-C

Message expressions are enclosed in square brackets as given below:
[receiver message]

Receiver can be a variable or expression that evaluates to an object (including the variable self)
■ A class name (indicating the class object)
■ super (indicating an alternative search for the method implementation)
The message is the name of a method plus any arguments passed to it.

Comments
Like C and C++ comments // and /*- - - - */ are allowed.
For example:

1. // comment.
2. /* comment.
       Comment. */