mpdecimal
C/C++ libraries for arbitrary precision decimal floating point arithmetic
libmpdec is a C implementation of the General Decimal Arithmetic Specification. The specification defines a general purpose arbitrary precision data type together with rigorously specified functions and rounding behavior. libmpdec conforms - with minor restrictions - to the IEEE 754-2008 Standard for Floating-Point Arithmetic, provided that the appropriate context parameters are set. libmpdec++ has a thread local context for inline operators and other functions that use the implicit context.
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