Functions:
A
function is a self contained block of statements enclosed between braces that
perform a specific task. A function groups a number of repeated statements in a
program into a single unit and is identified by a name known as a function
name. A program can contain one or more functions, but the main ( ) function
must be part of every program. It is the main ( ) function form which the
program’s execution begins. Other additional functions must be subordinate to
it and to one another. A programmer can invoke a function at different places
in a program whenever it is needed instead of writing the same set of
instructions again and again in the program. After the function has performed
the intended task, the control is returned back to the calling function and continues
with the rest of the statements in its body.
Classifications of
Functions:
Functions
can be classified broadly in two categories :
i.
Library functions.
ii.
User-defined functions
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