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+///////////////////////////////////////////////////////////////
+// Copyright 2013 John Maddock. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
+
+//[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_CONSTEXPR
+ /*->*/
+ constexpr float128 pi = 3.1415926535897932384626433832795028841971693993751058Q;
+ /*<-*/
+#endif
+ /*->*/
+ return 0;
+}
+//]
+