Test file input / output of SparseMatrix class
What will be an ideal response?
```
cout << endl << "Enter the SparseMatrix input filename => ";
cin >> infilename1;
ifstream infile1(infilename1.c_str(), ios::in);
infile1 >> sm1;
cout << endl << sm1 << endl;
cout << "Enter the output filename >> ";
cin >> outfilename;
ofstream outfile(outfilename.c_str(), ios::out);
outfile << sm1 << endl;
```
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