passing arrays to functions
---------------------------
the array processing routines. we look at what best can be done 
by encapsulating each one in a seperate C++ function. in each case, we will
have to pass the array, as a parameter, to the function; the function will process
the array in a particular way and return the required output from this processing
back to the caller of the function.
When an array is passed to a function as a parameter, the function can access the elements
of array, but function does not automaticly know how many elements are in the array; so,
we will also need to pass the lenght of the array to the function.

*the following program creates an array of integers, fills it with values & passes it to a 
function which sums the values.

//summing an array
#include<iostream.h>
int sum_array(int list[], int lenght);
void main(void)
{
	int list[15]; //the array
	for (int i = 0; i < 15; i++)
	{
		cout <<"Enter a value for the element " << i << " ";
		cin >> list[i];
	}
	int total = sum_array(list, 15); //function call
	cout <<"The sum of the array is " << total << endl;
}
int sum_array(int list[], int lenght)
{
	int total = 0;
	for (int i = 0; i < lenght; i++)
		total +=list[i];
	return total;
}