[Boost-users] [Units] Temperature conversion problem

Subject: [Boost-users] [Units] Temperature conversion problem
From: Belcourt, Kenneth (kbelco_at_[hidden])
Date: 2011-11-30 16:11:54

Hi,

There appears to be a temperature conversion problem between ºC and ºF.  Here's a simple test that shows the error under both gcc and Intel on both Darwin and Linux (with Boost trunk).

brisc:~ kbelco$ cat test3.cpp 
#include <iostream>
#include <boost/units/io.hpp>
#include <boost/units/quantity.hpp>
#include <boost/units/systems/temperature/celsius.hpp>
#include <boost/units/systems/temperature/fahrenheit.hpp>

int main(int, char **) {
  using namespace boost::units;
  quantity<fahrenheit::temperature> t(100 * celsius::temperature());

  // expect output of 212 F, produces 180 F
  // seems like not adding 32º offset when computing F = (C * 9/5 + 32)
  std::cout << t << std::endl;

  return 0;
}

brisc:~ kbelco$ icpc -g -Iboost test3.cpp

brisc:~ kbelco$ ./a.out
180 F

-- Noel