Test conversion from Matrix class

What will be an ideal response?

```
cout << endl << "Enter the Matrix input filename => ";
cin >> infilename2;
ifstream infile2(infilename2.c_str(), ios::in);
infile2 >> m1;
cout << endl << "Matrix input:" << endl << endl << m1 << endl;
SparseMatrix sm2 (m1);
cout << "Sparse Matrix conversion:" << endl << endl << sm2 << endl;
outfile << sm2 << endl;

return 0;
}

```