File I/O code snippets to read the first line of a file and convert it to a double.


///ReadDoubleFromFile reads the first line of a file

///and converts it to a double.

///From http://www.richelbilderbeek.nl/CppReadDoubleFromFile.htm

double ReadDoubleFromFile(const std::string& fileName)

{

  const std::vector<std::string> v = FileToVector(fileName);

  assert(v.empty()==false);

  const double d = std::atof(v[0].c_str());

  return d;

}

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(C++) ReadDoubleFromFile