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cd1e62a4b0
Change code snippets in docs to be complete programs to avoid any confusion. Fix failure caused by change to Boost.Random. Regenerate docs.
43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright 2013 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
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//[float128_eg
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#include <boost/multiprecision/float128.hpp>
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#include <boost/math/special_functions/gamma.hpp>
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#include <iostream>
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int main()
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{
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using namespace boost::multiprecision;
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// Operations at 128-bit precision and full numeric_limits support:
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float128 b = 2;
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// There are 113-bits of precision:
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std::cout << std::numeric_limits<float128>::digits << std::endl;
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// Or 34 decimal places:
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std::cout << std::numeric_limits<float128>::digits10 << std::endl;
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// We can use any C++ std lib function, lets print all the digits as well:
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std::cout << std::setprecision(std::numeric_limits<float128>::max_digits10)
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<< log(b) << std::endl; // print log(2) = 0.693147180559945309417232121458176575
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// We can also use any function from Boost.Math:
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std::cout << boost::math::tgamma(b) << std::endl;
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// And since we have an extended exponent range we can generate some really large
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// numbers here (4.02387260077093773543702433923004111e+2564):
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std::cout << boost::math::tgamma(float128(1000)) << std::endl;
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//
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// We can declare constants using GCC or Intel's native types, and the Q suffix,
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// these can be declared constexpr if required:
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/*<-*/
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#ifndef BOOST_NO_CONSTEXPR
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/*->*/
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constexpr float128 pi = 3.1415926535897932384626433832795028841971693993751058Q;
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/*<-*/
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#endif
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/*->*/
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return 0;
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}
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//]
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