c++ - 无法确定循环是如何放置的

Question

我想不通...

当 amount == 0 时，我希望程序退出，但如果我不完成整个过程，我希望再次询问最初的问题。当我输入 0 时，它现在正在崩溃。我不能使用 if 语句，只能使用循环。

main()
{
      int amount = 1;
      while(amount != 0)
      {
      cout <<"How many numbers do you wish to average? ";
      cin >> amount;
      int avg = 0, sum = 0;

            for (int lim = 0; lim < amount; lim++)
            {             
                cout <<"Enter a value (If multiple, one at a time)"<< endl;
                sum = sumNums(sum);
            }

            avg = sum / amount;
            displaySum (sum, avg);

      }
}

int sumNums (int sum)
{
    int number = 0;
    cin >> number;
    sum = sum + number;
    return sum;   
}

void displaySum (int sum, int avg)
{
     cout <<"The sum is "<< sum <<" and the average is "<< avg << endl;     
}

Answer 1

avg = sum / amount;

这行当 amount == 0 时崩溃，你需要用 if 语句保护它。