Declaration:
double frexp(double x,
int *exponent);The floating-point number x is broken up into
a mantissa and exponent.
The returned value is the mantissa and the integer
pointed to by exponent is the exponent. The
resultant value is x=mantissa * 2^exponent.
Range:
The mantissa is in the range of .5 (inclusive) to 1
(exclusive).
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