c++ - Visual Studio 不采用数组 : int magicSquare[n][n]?

Question

我写了我的代码，我准备提交它，但老师将在 Visual Studio 2015 上测试它。每次我测试它时，它都会给我一个错误，这个 int magicSquare[n][n ] 错误，无法读取 n。

我如何修改这部分以使 visual studio 从 n 读取这个数组？

我的代码:

 #include <iostream>
 using namespace std;
 // This function is to create the requested magic squares
int main()
{

  int n;
  //asking for n
  cout << "Please enter an odd number" << endl;
  cin >> n;

  //checking in case n doesnt follow rules
  if (n < 3 || n % 2 == 0)
  {
     cout << "Invalid Entry, Please re-enter an odd number that is 3 or larger " << endl;
  }
  else
  {
     // A function to generate odd sized magic squares

     int magicSquare[n][n];

     // Setting every slot to 0
     for (int i = 0; i < n; i++)
     {
        for (int j = 0; j < n; j++)
        {
           magicSquare[j][i] = 0;
        }
     }

     // Initializing position to 1
     int j = n / 2;
     int i = n - 1;

     // Setting each value to generate the magic square
     for (int num = 1; num <= n * n; )
     {
        if (j == -1 && i == n)
        {
            i = n - 2;
            j = 0;
        }
        else
        {
            //send to next number
            // moving it to the right side
            if (i == n)
                i = 0;
            //send to next number again
            // moving it to the upper side
            if (j < 0)
                j = n - 1;
        }
        //second condition
        if (magicSquare[j][i])
        {
            i -= 2;
            j++;
            continue;
        }
        else
            //add the number
            magicSquare[j][i] = num++;
        //first condition
        i++; j--;
    }
    //displaying sum of col/row
    cout << "The sum of each row/col: " << n * (n*n + 1) / 2 << endl;
    //Dispplaying magic square
    for (j = 0; j<n; j++)
    {
        for (i = 0; i<n; i++)
            cout << " " << magicSquare[i][j];
        cout << "\n";
    }

 }
   cout << endl;
   //re running program
   return main();
}

Answer 1

标准要求数组长度是一个可在编译时计算的值，以便编译器能够在堆栈上分配足够的空间。在您的情况下，您试图将数组长度设置为编译时未知的值。是的，我知道编译器应该知道它似乎很明显，但这里不是这种情况。编译器无法对非常量变量的内容做出任何假设。'n' 必须是一个常量值。