下面程序可以正确计算并输出 $3$ 名学生的平均成绩。

1struct Student {2   int id;3   int score;4};5 6int main() {7   Student students[3] = {8      {1, 90},9      {2, 80},10      {3, 100}11   };12 13   int sum = 0;14   for (int i = 0; i < 3; i++) {15      sum += students[i].score;16   }17   double average = sum / 3.0;18   cout << average << endl;19   return 0;20}