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PO
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Id
9627660
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0
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0
ClosedDate
CommentCount
2
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CreationDate
2012-03-09T01:20:29.693
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2013-11-17T14:05:35.570
LastEditDate
2013-11-17T14:05:35.570
LastEditorUserId
479995
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479995
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9626810
PostTypeId
2
Score
6
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text
Body
The <code>mpreal</code> is arbitrary precision floating-point numerical type. As such, <code>mpreal</code> numbers might have much more significant digits (even hundreds or thousandths) than <code>double</code>. Which means it is pointless to round <code>mpreal</code> to <code>double</code> before display - you will lose all the original accuracy in this case. It is easy to display <code>mpreal</code> in C++: <pre><code>/* 100-digits accurate pi */ mpreal pi = mpfr::const_pi(mpfr::digits2bits(100)); /* Show 60-digits of pi */ cout.precision(60); cout << pi; </code></pre> However you can use it with <code>printf</code> as well (by converting to string first): <pre><code>/* Display all digits (default formatting) */ printf("pi = %s\n", pi.toString().c_str()); /* Custom format, 60 digits */ printf("pi = %s\n", pi.toString("%.60RNf").c_str()); /* Using native printf from MPFR*/ mpfr_printf("pi = %.60RNf\n", pi.mpfr_srcptr()); </code></pre> Format specification for multiple-precision numbers are the same as for standard with the exception to rounding specification. You can safely use rounding to nearest,<code>RN</code> as in examples above. More details on mp-formatting are given in <a href="http://www.mpfr.org/mpfr-current/#doc" rel="nofollow">MPFR documentation</a>. (I'm author of <code>mpreal</code> class aka <a href="http://www.holoborodko.com/pavel/mpfr/" rel="nofollow">MPFR C++</a>) 
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1. POHow to use printf with mpfr and mpreal
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1. PTAnswer
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1. USPavel Holoborodko
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1. USPavel Holoborodko
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1. POHow to use printf with mpfr and mpreal
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