/**
 * Program to sum integers using array (example of while and for loops).
 * Improved version that stops and prints an error message if the array fills
 * up.  
 * (We don't need an array to solve this problem; it's used only to 
 * illustrate using an array.)
 */
#include <stdio.h>
#define ARRAY_SIZE 10

int main(void) {
    int input;
    int sum = 0;
    int num[ARRAY_SIZE];
    int count = 0;
    printf("enter some integers (at most %d values), anything else to stop\n",
            ARRAY_SIZE);

    while (scanf("%d", &input) == 1) {
        if (count >= ARRAY_SIZE) {
            printf("only %d values allowed\n", ARRAY_SIZE);
            return 1;
        }
        num[count++] = input;
    }
    for (int i = 0; i < count; ++i) {
        sum += num[i];
    }
    printf("sum is %d\n", sum);
    return 0;
}