#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
void doubleout(double y) { cout << " " << y; }
int main () {
  vector<double> x;
  x.push_back(1.1); x.push_back(2.2);  x.push_back(3.3);
  cout << "x vector: \n";
  for_each (x.begin(), x.end(), doubleout);
  cout<<endl;
  return 0;
}