#include <iostream.h>


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

   /* ------------------------------------------
      Constructor !!!
      ------------------------------------------ */
   MatrixNxN(int n)
   {
      cout << "Calling constructor with n = " << n << endl << endl;
      A = new float[n*n];
      N = n;
   }

   /* ------------------------------------
      AddNum(x): add number to matrix
      ------------------------------------ */
   void AddNum(float x)
   {
      int i, j;

      for (i = 0; i < N; i = i + 1)
         for (j = 0; j < N; j = j + 1)       
            A[i*N+j] = A[i*N+j] + x;
   };

   /* ------------------------
      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 i, j, k, N;

   N = 4;

   MatrixNxN M(N);

   k = 1;
   for (i = 0; i < N; i = i + 1)
      for (j = 0; j < N; j = j + 1)
      {
         M.A[i*N+j] = k;
         k = k + 1;
      }

   M.Print();

   M.AddNum(4);           // Compare with: AddNum(&M, 4);

   M.Print();
}