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7.3.5 Realvec input and output to a file

     /* you can do
     realvec foo;
     friend std::ostream& operator<<(std::ostream&, const realvec&);
     friend std::istream& operator>>(std::istream&, realvec&);
     // does the "file<<foo" method
     void write(std::string filename) const;
     void read(std::string filename);
     // input/output functions for line-separated text files
     void readText(std::string filename);
     void writeText(std::string filename);