Listing 2

#include <iostream.h>

int main()
    {
    double d;
    double total = 0;
    int n = 0;
    while (cin >> d)
         {
         cout << d << '\n';
         total += d;
         ++n;
         }
    cout << "average =" << total/n << '\n';
    return 0;
    }