Function in C

Function:- Function is a collection of instruction written in C language to perform some specific task. Every C program has at least one function which is main() ,each function having two parts prototype and body of the function.                                                                                                                                                                   A function declaration (prototype) tells the  compiler about a functions name,  return type and  parameters. A function definition provides the actual body of the function.

           Declaration of function 

               Syntax :- return_type  function_name(arg_type,arg_type);

               Example :-  int  circle_area (float );

       

                    In other words 

                                                Self contained block of one or more statement or a sub program which is designed for a particular task is known as Function.

     Function are classified into two types

1.  Library Function / Predefined Function 
2.  User defined Function