#include <math.h> double ldexp (double y, int n);
ldexp calculates y(2**n).
ldexp returns the value of type double that results from the
calculation.
stderr). +- HUGE_VAL is returned if
an overflow occurs; 0 is returned if an underflow occurs.
frexp, the ldexp function is useful in situations that require
repeated multiplication by 2. If the next multiplication causes an overflow
or underflow, use frexp to separate the mantissa from the
exponent. This gives you complete control over the exponent and the mantissa, so you
can operate on them separately without any loss of precision. When you are
finished, use ldexp to combine the mantissa and exponent again.
frexp, _ldexp
Copyright (c) 1998 SAS Institute Inc. Cary, NC, USA. All rights reserved.