#include <iostream>
#include <vector>
#include <numeric>

using namespace std;

template <typename T>
class Average {
public:
    void add(const T &value) {
        vec.push_back(value);
    }

    double average() {
        return accumulate(vec.begin(), vec.end(), 0.0) / vec.size();
    }

    void reset(){
        vec.clear();
    }

    void print() const{
        bool first = true;
        cout << "[";
        for (auto const &item : vec) {
            if (first) {
                cout << item;
                first = false;
            }
            else {
                cout << ", " << item;
            }
        }
        cout << "]" << endl;
    }

private:
    vector<T> vec;
};


int main()
{

Average<float> a1;
a1.add(1.5);
a1.add(6);
a1.add(2);
a1.add(9);
a1.print();
cout << "Average: " << a1.average() << endl;
a1.reset();
a1.print();


}