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What is Functions and Define its types


What is Functions


Function is the block of code which is used to perform a particular operation.

There are two type of the functions : 

(i)  Pre-defined functions 

(ii) User -defined functions .

Monolithic Programming : In this case , we write the entire login in the single program/

The disadvantages of the monolithic programming are,

(a) Difficult to understand.
(b) Difficult to modify
(c) Difficult of debug.

[Bug means computer program error and debugging is the process of locating and removing the computer    program error.]

 Modular Programming : In the case of the modular programming , we divide the entire complex program into the simple sub-programs or modules.These modules are also known as functions.

Advantages of the modular programming : 

(a) Easy to understand 
(b) Easy to debug
(c) Easy to modify 
(d) Resuability of code.

(i) Pre-defined Functions : These functions are defined in the header files. 

e.g.   stdio.h (printf() , scanf( ), 
conio.h ( ), clrscr( ) , getch( ) )

(ii) User-defined functions : These functions are defined by the user for there own prupose.

These functions contains the following components : 

(a) Function Prototype.

(b) Function call

(c) Function definition 






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