1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
///////////////////////////////////////////////////////////////
// Copyright 2011 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_
//[cpp_dec_float_eg
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/math/special_functions/gamma.hpp>
#include <iostream>
int main()
{
using namespace boost::multiprecision;
// Operations at fixed precision and full numeric_limits support:
cpp_dec_float_100 b = 2;
std::cout << std::numeric_limits<cpp_dec_float_100>::digits << std::endl;
// Note that digits10 is the same as digits, since we're base 10! :
std::cout << std::numeric_limits<cpp_dec_float_100>::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<cpp_dec_float_100>::max_digits10)
<< log(b) << std::endl; // print log(2)
// We can also use any function from Boost.Math:
std::cout << boost::math::tgamma(b) << std::endl;
// These even work when the argument is an expression template:
std::cout << boost::math::tgamma(b * b) << std::endl;
// And since we have an extended exponent range we can generate some really large
// numbers here (4.0238726007709377354370243e+2564):
std::cout << boost::math::tgamma(cpp_dec_float_100(1000)) << std::endl;
return 0;
}
//]
|
