I'm doing exercise 1.16 (p. 17) in C++ primer. The exercise is to get a set of numbers from user input `(std::cin)` and add them and output `(std::cout)`. My loop won't terminate with `std::cin >> input` as the condition. Once it runs out of numbers to add it reads from the keyboard again.

I'm a little familiar with C and in that language I believe we can do something like `while (input != \n)`, but I don't know what the character at the end of the buffer would be for `std::cin`. What is the terminating/last value in `std::cin` and why is it not working in my condition?

```
#include<iostream>

int main()
{
    int x = 0;
    int sum = 0;
    std::cout << "Enter a set of integers: " << std::endl;
    while (std::cin >> x)
        sum += x;

    std::cout << "The sum of those integers is " << sum << std::endl;

    std::cin.get();
    std::cin.get();
    return 0;
}

```