Re: [boost] [multiprecision] Bug in double to cpp_bin_float conversion?

Rob Conde wrote:

Consider the following code:

#include #include <iostream>

int main() { typedef boost::multiprecision::cpp_bin_float_quad float128_t;

float128_t f1(1e-9); float128_t f2("1e-9");

std::cout << std::setprecision(std::numeric_limits::max_digits10);

std::cout << f1 << std::endl; std::cout << f2 << std::endl;

return 0; }

I'm getting as output:

1.000000000000000062281591457779856419e-09 9.999999999999999999999999999999999325e-10

The conversion of the double literal is not as expected.

On wand box: http://melpon.org/wandbox/permlink/uSGNQZAEEytmb3ao

Is this a bug? If not, what would be the correct way to get my expected behavior?

What behavior do you expect?