//  A2_5.cpp

#pragma warning(disable : 4786)
#include <iostream>
#include <string>
#include <vector>
using namespace std;

// return type of T will also work, but may
// not return what you want for integers

template <class T> double getAvg(const vector<T> &v) {

  T sum = 0;
  vector<T>::const_iterator it;
  for(it=v.begin(); it!=v.end(); it++)
    sum += *it;
  double avg = sum/v.size();
  return sum;
}

void main() {

  double da[] = { 3.5, -7.8, 2.6 };
  vector<double> v(&da[0],&da[3]);

  cout << "\n  avg = " << getAvg(v) << "\n\n";
}