// Create empty vector container and push data in
#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
int main()
{
  vector<double> x;
  for(unsigned i=0;i<6;i++){
    x.push_back(pow(i,2)); // push i^2 to vector x
    cout<<"i="<<i<<" x="<<x[i];
    cout<<" size of x="<<x.size()<<endl;
  }
  cout<<"final     size ="<<x.size()<<"\n";
  cout<<"final capacity ="<<x.capacity()<<"\n";
}