FUNTION
The number of
statements grouped in a logical unit to perform to some specifics task.
Function makes program easier to understand
and maintain.
There are two types of function.
1. Library
function
2. User
defined function
1. Library
(Built in function)
The predefine
function, is called library function.
When we use any
library function then respective header file must be included. Otherwise we get
prototype Error.
We can’t
understand internal working of library function.
We are not able
to modified them.
Examlpe :
sqrt(),pow(),clrscr() …. etc .
2. User
defined function
The function
defined by the user , is known as user defined data type.
No need of any
specific task.
We can understand
internal working of user define data type.
We can modify
user defined function when ever essential.
We can create own
header files. By the using user defined function.
Example: square
IE. Square(81)=6561
Parts of Function
1) Function prototyping
It determines
function name,number of argument and their type and return types also.
It is generally
located as the top of the program. (After header file).
Data type(no. of arguments)
Function name
Return type
2) Function calling
It needs when we
want to execute the statement of function body.
When we
call(invoke) function any number of times.
Example:
sum(a,b);
It contains the
statement which can be execute after calling.
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.