vector<int> :: iterator it;
int i;
vector<int> A;
for (i=0;  i<5;  i++){
       A.push_back(i);
}

for(it = A.begin(); it != A.end(); it++){
cout<<*it;
}

#include <iostream>
#include <vector>

using std::vector;
using std::cout;
using std::endl;

int main()
{

  vector<int> :: iterator it;
  int i;
  vector<int> A;
  for (i = 0; i < 5; i++){
    A.push_back(i);
  }

  cout << "A.size() = " << A.size() << endl;

  for(it = A.begin(); it != A.end(); it++){
    cout<< *it;
  }

  cout << endl;

  return 0;
}