Function
A Function is a set of instructions which is used
to perform a specific task. Every C++ program has at least one function which
is main(). You can divide your
program info different function depending on you.
Syntax:
Return_type function_name(Parameters)
{
Statements of the
function;
}
Example:
A simple example of the function is the “clrscr()” function which is used to
clear the output window.
Function Declaration:
Function
declaration means how to declare a function. A basic syntax to declare a
function is as follow:
Return_type
function_name (data_type parameter1, …data_type parameterN);
You have to mention the
return type, the name of the function, parameters if any and put a terminator “
; ” at the end.
If there is no parameter then function
will:
Return_type function_name();
Example:
int odd (int);
Function is declared at the start of
the main().
Function declaration tells the
compiler about the structure of the function.
Function Definition:
The instructions in the body of a
function are collectively called as function definition. It defines that what a function will do?
A function definition can be written
at
·
Before main()
·
After main()
