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• Don't use #import. This is not standard C++, and will be treated differently by different compilers. Microsoft uses it to indicate that the included file is a type library, while gcc will pretend the included file has include guards.^† The standard library will always have include guards, so just use #include in this case.

• Your COLUMN_SEPARATOR uses a \t for alignment, which explains the wonky third line. It would be better to use std::setw from <iomanip> here:

   std::cout << std::setw(10) << i << COLUMN_SEPARATOR << std::setw(10) << toFahrenheit(i) << std::endl;
  

  If you're feeling ambitious, you can try overloading the << operator, as suggested in this SO answer.

^{† That is to say, it will include the file at most once.}