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# qd
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[This package](https://www.davidhbailey.com/dhbsoftware/) provides numeric
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types of twice the precision of IEEE double (106 mantissa bits, or
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approximately 32 decimal digits) and four times the precision of IEEE double
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(212 mantissa bits, or approximately 64 decimal digits). Due to features such
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as operator and function overloading, these facilities can be utilized with
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only minor modifications to conventional C++ and Fortran-90 programs.
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In addition to the basic arithmetic operations (add, subtract, multiply,
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divide, square root), common transcendental functions such as the exponential,
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logarithm, trigonometric and hyperbolic functions are also included.
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