/** @file list2812.cpp */
/** Listing 28-12. Converting to Floating-point Types */
struct rational
{
  float as_float()
  {
    return static_cast<float>(numerator) / denominator;
  }

  double as_double()
  {
    return numerator / static_cast<double>(denominator);
  }

  long double as_long_double()
  {
    return static_cast<long double>(numerator) / 
           static_cast<long double>(denominator);
  }

#include "list2812.code"

};

int main()
{
  rational pi(355, 113);
  rational bmi(90*100*100, 180*180); // Body-mass index of 90 kg, 180 cm
  double circumference(0), radius(10);

  circumference = 2 * pi.as_double() * radius;
  std::cout << "circumference of circle with radius " << radius << " is about "
            << circumference << '\n';
  std::cout << "bmi = " << bmi.as_float() << '\n';
}