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Diffstat (limited to 'Doc/lib/libdecimal.tex')
| -rw-r--r-- | Doc/lib/libdecimal.tex | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/Doc/lib/libdecimal.tex b/Doc/lib/libdecimal.tex index 6e46c11..bcd5b2b 100644 --- a/Doc/lib/libdecimal.tex +++ b/Doc/lib/libdecimal.tex @@ -501,13 +501,15 @@ with the \class{Context} constructor. arithmetic operations in the context. The \var{rounding} option is one of: - \constant{ROUND_CEILING} (towards \constant{Infinity}), - \constant{ROUND_DOWN} (towards zero), - \constant{ROUND_FLOOR} (towards \constant{-Infinity}), - \constant{ROUND_HALF_DOWN} (towards zero), - \constant{ROUND_HALF_EVEN}, - \constant{ROUND_HALF_UP} (away from zero), or - \constant{ROUND_UP} (away from zero). + \begin{itemize} + \item \constant{ROUND_CEILING} (towards \constant{Infinity}), + \item \constant{ROUND_DOWN} (towards zero), + \item \constant{ROUND_FLOOR} (towards \constant{-Infinity}), + \item \constant{ROUND_HALF_DOWN} (to nearest with ties going towards zero), + \item \constant{ROUND_HALF_EVEN} (to nearest with ties going to nearest even integer), + \item \constant{ROUND_HALF_UP} (to nearest with ties going away from zero), or + \item \constant{ROUND_UP} (away from zero). + \end{itemize} The \var{traps} and \var{flags} fields list any signals to be set. Generally, new contexts should only set traps and leave the flags clear. @@ -834,6 +836,8 @@ The following table summarizes the hierarchy of signals: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \subsection{Floating Point Notes \label{decimal-notes}} +\subsubsection{Mitigating round-off error with increased precision} + The use of decimal floating point eliminates decimal representation error (making it possible to represent \constant{0.1} exactly); however, some operations can still incur round-off error when non-zero digits exceed the @@ -881,6 +885,7 @@ Decimal("0.0060000") Decimal("0.0060000") \end{verbatim} +\subsubsection{Special values} The number system for the \module{decimal} module provides special values including \constant{NaN}, \constant{sNaN}, \constant{-Infinity}, |