下面C++代码用于记录多个输入数中的最大数和最小数（输入 -999 则输入结束），相关说法错误的是（
）。
cin >> now_num;min_num = max_num = now_num; while (now_num != -999){ if (max_num < now_num) max_num = now_num; if (min_num > now_num) min_num = now_num; cin >> now_num;}cout << min_num << ' ' << max_num;