How to manipulate vector of class type in C++

[D_Drmmr]

But I met another problem with my code using getline(cin,temp);
I changed my code to this. The thing is, the first time in the do...while loop, everything is good.
But after i input 'y' to execute another do...while loop, it just skip the new_book.getname() part.
I believe it's something wrong with the getline usage. Because if i changed it to cin>>temp, it works just
fine.

The problem is that after you read the price using >> the endline following the price remains in the input stream. Next time you call getline, it will read an emtpy line (i.e. only the endline character). The easiest way to avoid this is to use getline all the time, then use a stringstream to parse the input.

#include <iostream>
#include <sstream>

int main()
{
    std::string name;
    std::getline(std::cin, name);

    int price;
    std::string line;
    std::getline(std::cin, line);
    std::istringstream iss(line);
    iss >> price;
}

Also see http://www.parashift.com/c++-faq-lite/input-output.html