#include<stdio.h>

/**
 * Terry Harvey CIS 105 Section 010 TA Tina Weymouth
 *  Demonstration program for calculating a sum without storing all data
 **/

int main(){

    int data;
    int sum = 0;

    printf("Enter an integer: ");
    scanf("%d", &data);

    while (data!= -1){//BAD SENTINEL can't have -1 in data
        sum += data; //same as: sum = sum + data
        printf("Enter an integer: ");
        scanf("%d", &data);
    }

    printf("Sum is: %d\n", sum);
    return 0;

}