Sum any number of integers using a vector

#include <iostream>
#include <vector>
#include <string>
using namespace std;
// Enter any number of integers and
// display how many numbers there are and the sum.
int main()
{
    vector<int> numbers; // The values entered.
    int sum = 0; // The sum of the values entered.
    string input; // Input.
    int current_number = 0; // Input converted to integer.

    cout << "Enter any number of integers, one at a time.\n"
        "Enter 'x' on a line by itself when you're finished." << endl;
    cin >> input; // Store input.
    while (input != "x") // Unless you're finished.
    {
        current_number = stoi(input); // Convert the input to an integer
        numbers.push_back(current_number); // Store the integer.
        sum += current_number; // Add the number to the total.
        cin.clear(); // Reset error flags.
        cin.ignore(100, '\n'); // Ignore up to the new line.
        cout << "Enter your next number: " << endl; // Display the sum.
        cin >> input; // Store input.
    }
    cout << endl; // Blank line.
    cout << "The sum of " << numbers.size()
        << " numbers is: " << sum << endl; // Display the sum.

    return 0;
}