[Boost-commit] svn:boost r77626 - sandbox/big_number/libs/multiprecision/example

Subject: [Boost-commit] svn:boost r77626 - sandbox/big_number/libs/multiprecision/example
From: john_at_[hidden]
Date: 2012-03-29 08:28:32

Author: johnmaddock
Date: 2012-03-29 08:28:31 EDT (Thu, 29 Mar 2012)
New Revision: 77626
URL: http://svn.boost.org/trac/boost/changeset/77626

Log:
Extend examples using Paul Bristow's comments.
Text files modified: 
   sandbox/big_number/libs/multiprecision/example/cpp_dec_float_snips.cpp |    10 ++++++++--                              
   1 files changed, 8 insertions(+), 2 deletions(-)

Modified: sandbox/big_number/libs/multiprecision/example/cpp_dec_float_snips.cpp
==============================================================================
--- sandbox/big_number/libs/multiprecision/example/cpp_dec_float_snips.cpp	(original)
+++ sandbox/big_number/libs/multiprecision/example/cpp_dec_float_snips.cpp	2012-03-29 08:28:31 EDT (Thu, 29 Mar 2012)
@@ -17,12 +17,18 @@
    // 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;
-   // We can use any C++ std lib function:
-   std::cout << log(b) << std::endl; // print log(2)
+   // 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;
    //]
 }