frexp - Decomposes its argument into an exponent of 2 and a factor
double frexp -> double integer
-5 dexp frexp -> 0.5 -4
This is an interface to the C++ function
double std::frexp(double,int*)
In accordance with the normalized representation of the mantissa
in IEEE doubles, the factor is in the interval [0.5,1).
Stroustrup 3rd ed p 661
Diesmann
17.5.2005
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