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

void clear_vector(vector <double> v)
{
  int i;

  for (i = 0; i < v.size(); i++) v[i] = 0;
}

main()
{
  vector <double> a;

  a.push_back(1);
  clear_vector(a);
  cout << a[0] << endl;
}