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;
}
```
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