2_Objective-C Functions

  • A function is a group of statements that together perform a task.
  • There is one C function, called main()
  • All of the most trivial programs can define additional functions.

Function Declaration

A function declaration tells the compiler about a

  • function’s name
  • return type
  • parameters.

Function Definition

A function definition provides the actual body of the function.


  • in Objective-C, we call the function as method.
  • The Objective-C foundation framework provides numerous built-in methods that your program can call
  • A method is known with various names like a function or a sub-routine or a procedure, etc.


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