#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
    int numBooks = 0;               // # of books for this order
    int totalNumBooks = 0;          // total # of books ordered by customer

    while (numBooks >= 0 && numBooks <= 10)
    {	
        cout << "Enter number of books: ";
        cin >> numBooks;

        totalNumBooks += numBooks;
    }

    cout << "The total number of books ordered is " << totalNumBooks << endl;
		
    system("pause");
    return 0;
}// end of main