#include <iostream>
#include <vector>
using namespace std;

int main () {
    vector<double> v;
    v.push_back(2.7);
    v.push_back(5.6);
    v.push_back(7.9);

    for(int i = 0; i < v.size(); ++i) {
        cout << "v[" << i << "]==" << v[i] << "\n";
    }

}