How so I implement the mean1d function in order to find the mean?

[BrandenBTW]

#include <iostream>
using namespace std;

int main()
{

//I'll be making a 1 dimensional array
int array1d[25];


array1d[0] = 9;
array1d[1] = 8;
array1d[2] = 7;
array1d[3] = 5;
array1d[4] = 3;
array1d[5] = 7;
array1d[6] = 4;
array1d[7] = 7;
int array1d_size = 8;

cout << "The original array is: { ";
for (int i=0; i<array1d_size; i++)
cout << array1d[i] << " ";
cout << "} " << endl;


double the_mean = mean1d(array1d, array1d_size);
cout << "\n=====> The mean is: " << the_mean; 

}

[mobotus]

#include <iostream>

using namespace std;

const int SIZE = 25;

double the_mean(int[], int);//Function Prototype

int main()
{

	double mean;

	int array1d[SIZE] = { 9, 8, 7, 5, 3, 7, 4, 7 };

	cout << "The original array is: { ";
	for (int i = 0; i<SIZE; i++)
		cout << array1d[i] << " ";
	cout << "} " << endl;

	mean = the_mean(array1d, SIZE);//Call to function
	cout << "\n=====> The mean is: " << mean;

}

double the_mean(int array1d[], int SIZE){//Function
	//Code Here
}

http://www.cplusplus.com/doc/tutorial/functions/