1  #include "matrix1.h"
  2  
  3  int main()
  4  {
  5     Matrix m;
  6     m[0][0] = m[1][1] = m[2][2] = 1;
  7     m(0,1) = m(1,2) = 2;
  8     cout << 2 * m << "\n";
  9     cout << m * m << "\n";
 10     cout << 2 * m + m * m;
 11     return 0;
 12  }