c++ - C++ 总分

Question

好吧，当我运行这段代码时，我得到我的总和等于 0 并且弄乱了我的平均水平和成绩。我不确定我做错了什么total += scores 函数在它应该在的地方，但它仍然没有加起来分数。

int validateNumber(int, int, int);

在 main() 函数中

int num, score, total = 0;

和

validateNumber(num, score, total);

和定义

int validateNumber(int num, int score, int total) {
  while (num < 1 || num > 4) {
    cout << over3 << num << " is not between 1 and 4! Try again: ";
    cin >> num;
  }
  system("CLS");
  for (int i = 1; i <= num; i++) {
    cout << over3 << "Enter score " << i << ": " << endl;
    cout << over3 << "Enter a value from 0 to 100: ";
    cin >> score;
    while (score < 0 || score > 100) {
      cout << over3 << score
           << " is not between 0 and 100! Renter the score: " << i << ": ";
      cin >> score;
    }
    total += score;
  }
  return total;
}

Answer 1

如果你想像这里那样实现validate()函数，

validateNumber(num,score,total);

您可以将其设置为 void 并传递变量 total 作为引用。例如，

void validateNumber(int num, int score, int &total) {
  while (num < 1 || num > 4) {
    cout << over3 << num << " is not between 1 and 4! Try again: ";
    cin >> num;
  }
  system("CLS");
  for (int i = 1; i <= num; i++) {
    cout << over3 << "Enter score " << i << ": " << endl;
    cout << over3 << "Enter a value from 0 to 100: ";
    cin >> score;
    while (score < 0 || score > 100) {
      cout << over3 << score
           << " is not between 0 and 100! Renter the score: " << i << ": ";
      cin >> score;
    }
    total += score;
  }
}

其余的都是一样的...否则我不会在这种情况下使用 3 个参数。例如，

int validateNumber(int num) {
  int total=0,score;
  while (num < 1 || num > 4) {
    cout << over3 << num << " is not between 1 and 4! Try again: ";
    cin >> num;
  }
  system("CLS");
  for (int i = 1; i <= num; i++) {
    cout << over3 << "Enter score " << i << ": " << endl;
    cout << over3 << "Enter a value from 0 to 100: ";
    cin >> score;
    while (score < 0 || score > 100) {
      cout << over3 << score
           << " is not between 0 and 100! Renter the score: " << i << ": ";
      cin >> score;
    }
    total += score;
  }
  return total;
}

和调用:

int num, total;
...
total=validateNumber(num);

希望对您有所帮助...