#include <iostream.h>

class myMatrixNxN
{
public:              // This class has the SAME structure as MatrixNxN
   float *A;
   int    N;
};

// --------------------------------------------- MatrixNxN: Dynamic size matrix
class MatrixNxN
{
private:
   float *A;
   int    N;

public:
   /* ------------------------------------------
      Constructor(int)
      ------------------------------------------ */
   MatrixNxN(int n)
   {
      cout << "Allocating an nxn float matrix, with n = " << n << endl << endl;
      A = new float[n*n];
      N = n;
   }

   /* ------------------------
      Print(): print matrix
      ------------------------ */
   void Print()
   {
      int i, j;

      for (i = 0; i < N; i = i + 1)
      {
         for (j = 0; j < N; j = j + 1)
            cout << A[i*N+j] << "\t";
         cout << "\n";
      }
      cout << "\n";
   };
};
// -----------------------------------------------------------------------




int main(int argc, char *argv[])
{
   int N = 4;
   MatrixNxN M(N);
   myMatrixNxN *X;

   X = (myMatrixNxN *) &M;    // Copy the address of M into X
			      // Now we can get to the private variables !!!

   int i, j, k;


   k = 1;
   for (i = 0; i < N; i = i + 1)
      for (j = 0; j < N; j = j + 1)
      {
         X->A[i*N+j] = k;   // I CAN access private member variable !!
         k = k + 1;
      }

   cout << "Matrix M:" << endl;
   M.Print();
   cout << endl;
}