#include <algorithm>
#include <vector>
#include <iostream>
#include <iterator>
#include <numeric>
 
std::vector<int> gAverage = {3,2,1,0};
double average;
 
using namespace std;
 
void lAverage()
{
    if (gAverage.size() >= 2)
    {
    	auto itLast = gAverage.end() - 2; 
        cout << endl << "The average of: ";
        copy(gAverage.begin(), itLast, ostream_iterator<int>(cout, ","));
        cout << *itLast << " = " << average << endl;
   }
}
 
int main()
{
    average = std::accumulate(gAverage.begin(), gAverage.end() - 1, 0) / (double)(gAverage.size() - 1);
    lAverage();
}
 

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