c++11 - Strange behaviour of for_each and push_back() -

i doing testing for_each , use of lambda functions , i'm stuck on (compiled g++ -std=c++11, gcc version 5.3.1)

#include <iostream> #include <vector> #include <algorithm> using namespace std;  int main() {      vector<int> vi = {1,1,1,1};     int end =0;      cout << "vi contains: ";     for_each(vi.begin(), vi.end(),[](int i){         cout << << " ";     });     cout << endl;      for_each(vi.begin(),vi.end(),[&](int i){         cout << "i="<<i<<" ";         if(i==1){             vi.push_back(1);             end++;         }     });      cout << endl;     cout << "end=" << end << endl;     cout << "now vi contains: ";      for_each(vi.begin(), vi.end(),[](int i){         cout << << " ";     });     cout << endl;     return 0; } 

and output of code

vi contains: 1 1 1 1  i=1 **i=0** i=1 i=1  end=3 vi contains: 1 1 1 1 1 1 1  

why is, @ first iteration of loop, equal 0?