Cin in a while loop

Question

So, I\'ve looked around and haven\'t been able to figure out what\'s going on with cin during my While loop. I\'m working through the book C++ Primer (5th edition) and I noticed

Answer 1

There is an easier way to do this:

const string hexdigits = "0123456789ABCDEF";
cout << "Enter a series of numbers between 0 and 15 separated by spaces. Hit ENTER when finished: " << endl;
string line;
string result;
if (getline(cin, line)) // get the whole line
{
    istringstream iss(result); // break them by spaces
    int i;
    while (iss >> i)
    {
        result += hexdigits[i];
        result += " ";
    }
    cout << "Your hex result:  " << result << endl;
}
else
{
    cout << "Error handling input!" << endl;
}

With your solution, you would need to press Ctrl-D to end the input.