Output to files
New IO streams can be declared, using the type fstream. A stream is associated with an external
file when it is opened. Its access mode is set in the same function call.
If a file is not opened for a stream, the nil pointer is returned.
fstream O_file;
fstream I_file;
O_file.open("info.dat", ios::out);
I_file.open("results.dat",ios::in);
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