[Boost-bugs] [Boost C++ Libraries] #11178: cpp_dec_float calculation bug

Subject: [Boost-bugs] [Boost C++ Libraries] #11178: cpp_dec_float calculation bug
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-04-09 17:01:00

#11178: cpp_dec_float calculation bug
------------------------------+----------------------------
 Reporter:  nxjiang1@…        |      Owner:  johnmaddock
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  multiprecision
  Version:  Boost 1.57.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+----------------------------
 #include <iostream>

 #include <boost/multiprecision/cpp_dec_float.hpp>

 using namespace boost::multiprecision;
 using namespace std;

 int main(int argc, char *argv[]) {
     cpp_dec_float_100 p("4.5");
     cpp_dec_float_100 a("7.2");

     cpp_dec_float_100 r = p / a;//("0.625");
     cout << r.str() << endl;

     if (r == cpp_dec_float_100("0.625")) cout << "HOHO" << endl;
     cout << r.str(2, ios_base::fixed) << endl;

     r *= 100;
     cout << r.str(2, ios_base::fixed) << endl;
     r = round(r);
     cout << r.str(2, ios_base::fixed) << endl;
     r /= 100;

     cout << r.str(2, ios_base::fixed) << endl;

     return 0;
 }

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11178>
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