列出偶數個數&總和

/* 既然老師說不考陣列 那我乾脆也不用陣列了... */
/* 寫到一半的OS: WTF 如果不用陣列 又不從檔案輸入測試資料的話 要怎麼印出所有偶數? 不會變成邊打邊印嗎?
   決定還是用陣列了..... XD */
#include <stdio.h>

int main ()
{
    int num, sum=0, even_count=0, even_array[100], i;

    printf ("Please input numbers (-1 to exit): ");

    while (1)
    {
        scanf ("%d", &num);
        if (num == -1) break;
        if (num % 2 == 0)
        {
            even_array[even_count] = num;
            even_count++;
            sum += num;
        }
    }

    printf ("There are %d even numbers are in the array:\n", even_count);
    for (i = 0; i < even_count; i++)
        printf ("%d ", even_array[i]);
    printf ("\n\nThe sum of these numbers are %d\n", sum);

    return 0;
}