STL_vector1

#include<iostream>
#include<vector>
#include<string>
using namespace std;
struct R{
  string title;
  int rating;
 };
bool fillr(R & rr);
void showr(const R & rr);


void main(){
vector<R>books;
R temp;
while(fillr(temp))
   books.push_back(temp);
int num=books.size();
cout<<"size::"<<num<<endl;
if(num>0)
{
   cout<<"thank you.you entered the following:\n"<<"rating\tbookk\n";
   vector<R>::iterator pr;
   for(pr=books.begin();pr!=books.end();pr++)
       showr(*pr);
   vector<R>oldlist(books);
   
   if(num>3){
      
   books.erase(books.begin()+1,books.begin()+3);
   cout<<"after erasure:\n";
      

   for(pr=books.begin();pr!=books.end();pr++)
       showr(*pr);
   books.insert(books.begin(),oldlist.begin()+1,oldlist.begin()+2);       
   cout<<"atter insertion\n";
   for(pr=books.begin();pr!=books.end();pr++)
       showr(*pr);
   
   }
   books.swap(oldlist);
   cout<<"swapping oldlist with bookd:\n";
   for(pr=books.begin();pr!=books.end();pr++)
       showr(*pr);
}
else
cout<<"bothing entered,nothing gained.\n";

}

bool fillr(R &rr){
cout<<"enter book title(quit to quit):"<<endl;
getline(cin,rr.title);
if(rr.title=="quit")return false;
cout<<"enter book ratingg:";
cin>>rr.rating;
if(!cin)return false;
  cin.get();
return true;

}

void showr(const R & rr)
{
cout<<rr.rating<<"\t"<<rr.title<<endl;
}