Function , Arguments/Parameter in C

• Function can be described as a group of Code to do specified things. 

• Argument = Parameter of the function 

Defining a Function

return_type function_name( parameter list )
{
   body of the function
}

 

•  Return Type: A function may return a value. The return_type is the data type of the value the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the keyword void.

• Function Name: This is the actual name of the function. The function name and the parameter list together constitute the function signature. 
   
  • Parameters: A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters. 
  • Function Body: The function body contains a collection of statements that define what the function does.
   

 To make it clear, Lets Jump to Code::Blocks

Function is not always placed before int main ().
 Every function usually have the return value,
i have explained it on the pic . 


Here's an example without using return value,
 usually we call it as a procedure. 

source : http://www.tutorialspoint.com/cprogramming/c_functions.htm

Hope This Basic Functions will Help.

Peace!