Functions break problems into smaller, more manageable steps and allow code to be reused. A function header specifies the return type, name, and parameters. The body contains local variable declarations and statements that solve the problem, ending with a return. Parameters in the header communicate with code outside the function, while local variables are private and only used within the function.

1. Functions:
Advantages:
1. Problem can be factored into understandable and manageable steps.
2. Functions provide a way to reuse code.
3. Functions will protect data.
Function Header
Function Header:
A function header consists of three parts: The return type,the function name, and the formal parameter
list.
Function Body:
The function body contains the local declarations and the function statements. The body starts with
local definitions that specify the variables needed by the function.After the local definitions, the
function statements, terminates with a return statement.
Formal Parameter List:
Parameters contained in the formal parameter list.
Local variables:
Variable that is defined inside a function and used without having any role in the communication
Between functions.
Function Declaration:
Function declarations consists only of a function header,they contain no code.
return_type function_name (formal parameter list)
{
//Local Declarations
//Statements
} //function_name