vector c++

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

int main()
{
    vector<int> v; // create vector
    for(int i=0; i<9; i++)
    v.push_back(i*i); // add to end

    vector<int>::iterator iter; //create iterator

    for(iter=v.begin(); iter!=v.end(); iter++)
    cout<<*iter<<endl;

    if(v.empty())
    {
        cout<<"vector is empty"<<endl;
    }
    else
    {
        cout<<"vector is not empty"<<endl;
    }

    cout<<"vector deletion from end"<<endl;
    for(iter=v.begin(); iter!=v.end()-3; iter++)
    v.pop_back();
    cout<<"the actual vector"<<endl;
    for(int i=0; i<v.size(); i++) // alternative
    cout<<v[i]<<endl;

    return 0;
}