/*
    loop4.cpp
    Dave Klick
    CIS 150
    2017-02-14
    
    Demonstration total of user input.
*/

#include <iostream>
using namespace std;

int main() {
    // initialize accumulator
    int total = 0;
    int num;

    do {
        // -1 is called the sentinel value since it is a special
        // value which signals the end of the loop
        cout << "Enter a number to add (-1 to quit): ";
        cin >> num;
        
        // do NOT add the sentinel value in to the total
        if (num != -1) total = total + num;
    } while (num != -1);
    cout << "The total is " << total << endl;

    return 0;
}