123456789101112131415161718192021222324252627282930313233343536373839404142 |
- ///////////////////////////////////////////////////////////////
- // Copyright 2013 John Maddock. Distributed under the Boost
- // Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
- //[float128_eg
- #include <boost/multiprecision/float128.hpp>
- #include <boost/math/special_functions/gamma.hpp>
- #include <iostream>
- int main()
- {
- using namespace boost::multiprecision;
- // Operations at 128-bit precision and full numeric_limits support:
- float128 b = 2;
- // There are 113-bits of precision:
- std::cout << std::numeric_limits<float128>::digits << std::endl;
- // Or 34 decimal places:
- std::cout << std::numeric_limits<float128>::digits10 << std::endl;
- // We can use any C++ std lib function, lets print all the digits as well:
- std::cout << std::setprecision(std::numeric_limits<float128>::max_digits10)
- << log(b) << std::endl; // print log(2) = 0.693147180559945309417232121458176575
- // We can also use any function from Boost.Math:
- std::cout << boost::math::tgamma(b) << std::endl;
- // And since we have an extended exponent range we can generate some really large
- // numbers here (4.02387260077093773543702433923004111e+2564):
- std::cout << boost::math::tgamma(float128(1000)) << std::endl;
- //
- // We can declare constants using GCC or Intel's native types, and the Q suffix,
- // these can be declared constexpr if required:
- /*<-*/
- #ifndef BOOST_NO_CXX11_CONSTEXPR
- /*->*/
- constexpr float128 pi = 3.1415926535897932384626433832795028841971693993751058Q;
- /*<-*/
- #endif
- /*->*/
- return 0;
- }
- //]
|