// print all but 2 elements of
// a vector container using iterator (it)
#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
int main()
{
  vector<double> x;
  // push i^2 
  for(unsigned i=0;i<6;i++){
    x.push_back(pow(i,2));
  }
  // all but the last two elements: iterator
  for(auto it=x.begin(); it!=x.end() - 2; it++){
    cout<<*it<<' ' ;
  }
  cout<<endl;
  // all elements: range-for loop 
  for(auto elem:x) cout<<elem<<' ';
  cout<<endl;
}
// output:  
// 0 1 4 9
// 0 1 4 9 16 25