SpecialValue is a C++ library that allows special numeric values to be represented accurately. This is useful for fractions that would normally be approximated as floating point, or numbers that are normally impossible to store, such as sqrt(-2). This free software library implements a number of special values for computer arithmetic use. The ideas behind the implementation are described in ‘Universal semantics for computer arithmetic implementations’ by B. Verdonk, J. Vervloet and A. Cuyt. (Source: http://freecode.com/)

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