第16章 类和标准模板库

 

 

 

 

 

 

 

#include <string>
#include <vector>

struct Review{
     std::string title;
     int rating;
}
bool FillReview(Review & rr);
void ShowReview(const Review &rr);

int main(0
{
   using std::cout;
   using std::vector;
   vector<Review> books;
   Review temp;
   while {FillReview(temp))
   books.push_back(temp);
int num=books.size();
if (num>0)
{
   cout<<"Thank you you entered the folling:\n"<<"rating\tbook";
   for (int i=0;i<num;i++)
     showreview(books[i]);
   cout<<"repring:\n"<<"rating\tbppk\n";
   vector<review>::iterator pr;
   for (pr = books.begin();pr!=books.end();pr++)
       showreview(*pr);
   vector<review> oldlist(books);
   if(num>3)
   {
     books.ease(books.begin()+1,books.begin()+3);
     cout<<"after erasure:\n";
     for(pr=books.begin();pr!=books.end();pr++)
        showreview(*pr);
     books.insert(books.begin(),oldlist.begin()+1,oldlist.begin()+2);
     cout<<"after insertion:\n";
     for(pr=books.begin();pr!=books.end();pr++)
         showreview(*pr);
    }

   books.swap(oldlist);
   cout<<"swapping oldlis with books:\n";
   for (pr=books.begin();pr!=books.end();pr++)
     showreview(*pr);
}
  else
   cout<<"Nothing entered,nothing gained.\n";
   return 0;
}
bool fillreview(review & rr)
{
  std::cout<<"enter book title(quit to quit):";
  std::getline(std::cin,rr.title);
  if(rr.title == "quit")
    return false;
  std::cout<<"enter book rating:";
  std::cin>>rr.rating;
  if(!std::cin)
     return false;
  while (std:;cin.get()!='\n')
     continue;
  return true;
}
void showreview (const review && rr)
{
  std::cout<<rr.rating<<"\t"<<rr.title<<std:;endl;
}