// A3.cpp

#include <vector>
#include <iostream>

template <class T>
T average(const std::vector<T> &v) {

  int i;
  T sum = 0;
  for(i=0; i<v.size(); i++)
    sum += v[i];
  return (sum/v.size());
}

void main() {

  std::vector<double> vd;
  vd.push_back(2.5);
  vd.push_back(3.0);
  vd.push_back(3.5);
  vd.push_back(4.0);

  std::cout << "\n  avg = " << average(vd) << "\n\n";
}