functions in c programming | introduction to functions in c programming

 Functions in c programming 

Defination::-


In c language program can be


divided into a series of individual


related programs called modules.


This modules are called functions.


There are two types of functions::


1》built-in-function



2》UDF [user defined function]



1》built -in-function:-It is


a collection of various types of


functions  which perform some


standard and ore-defined  task


 these functions which are


part of C  compiler that have

 

Been written for general


purpose are Called


library / built in function.


Example:-sqrt ( ),  int ( ),  cds ( ),


Scanf ( ),  printf ( ) , etc,.


Advantages of built in function::-


●The  programmer job is made


easier. because  the functions are


already available.


●this can be used whenever


required.


2》usd  [ user defined function ]:-


In  most cases the programmers


Need other library functions to


achieve  some specific tasks. These


Functions which are written by the


Users to do some specific tasks are


Called usd [user defined function].


Advantages of usd [user defined function]::-


● reusability and reduction of code size.


●reliability of the Program cab be increased.


●modular programming approach.


●Easier debugging.


●built library function.