cout << "   ";
        for(i = 0; i < k; i++) cout << setw(3) << i;
        cout << endl << endl;
        for(i = 0; i < w; i++)
        {
            cout << setw(3) << i;
            for(j = 0; j < k; j++) cout << setw(3) << (int) tab[i][j];
            cout << endl;
        }