#include <iostream>
#include <vector>

using namespace std;

int main(){
  cout << endl<< "*** Exercise 3.13 but with iterators****" << endl<< endl<<"Please enter some integers (ENTER and Ctrl+d when you are done)"<< endl;
  vector<int> vecinput;
  int input;
  while(cin>>input)
    vecinput.push_back(input);

  cout << endl<<"Now let's sum adjacent numbers from the list" << endl;

  for(vector<int>::iterator iter=vecinput.begin();iter!=vecinput.end(); ++iter){
    if(iter!=vecinput.end()-1)
      cout <<"veciput["<<iter-vecinput.begin()<<"]+vecinput["<<iter+1-vecinput.begin()<<"]="<<*iter+*(iter+1)<< endl;
  }

  if(vecinput.size()/2!=vecinput.size()/2e0)
    cout << "There is an odd number of integers and the last element is ="<< vecinput[vecinput.size()-1]<< endl<< endl;

  cout << "Finally..."<< endl;

  for(vector<int>::iterator iter=vecinput.begin();iter!=vecinput.begin()+vecinput.size()/2; ++iter){
    cout <<"veciput["<<iter-vecinput.begin()<<"]+vecinput["<<vecinput.end()-1-iter<<"]="<< *iter+*(vecinput.begin()+(vecinput.end()-1-iter))<< endl;
  }
  

  return 0;
}