#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>

namespace {

  template< typename T >
  T StringTo(const std::string& s, std::ios::fmtflags format = std::ios::dec)
  {
      T rv = 0;
      std::istringstream istrm(s.c_str());
      istrm.setf(format, std::ios::basefield);
      istrm >> rv;
      return rv;
  }

  template< typename T >
  std::string StringFrom(T value)
  {
      std::ostringstream rv;
      rv << value;
      return rv.str();
  }

}

int main(int argc, char* argv[])
{
    int rv = 0;
    try {
        while (std::cin) {
            std::string sin;
            std::cout << "Enter floating point: ";
            getline(std::cin, sin);
            if (std::cin) {
                double d = StringTo<double>(sin); 
                std::cout << "StringTo<double>(\"" << sin << "\") = "
                     << d << std::endl;
                std::string sout = StringFrom<double>(d);
                std::cout << "StringFrom<double>(" << d << ") = \""
                     << sout << "\"" << std::endl;
            }
            std::cout << std::endl;
        }
    } catch (const std::exception& e) {
        std::cerr << "*** Error: " << e.what() << std::endl;
        rv = 1;
    }

    return rv;
}