// C++ program to calculate average of array elements
#include <iostream>
using namespace std;

// Function that return average of an array.
double average(int a[], int n)
{
    // Find sum of array element
    int sum = 0;
    for (int i=0; i<n; i++)
       sum += a[i];

    return sum/n;
}

// Driver code
int main()
{
    int arr[] = {10, 2, 3, 4, 5, 6, 7, 8, 9};
    int n = sizeof(arr)/sizeof(arr[0]);

    cout << average(arr, n) << endl;
    return 0;
}