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LOGB(3)			   Linux Programmer's Manual		       LOGB(3)

NAME
       logb, logbf, logbl - get exponent of a floating point value

SYNOPSIS
       #include <math.h>

       double logb(double x);
       float logbf(float x);
       long double logbl(long double x);

       Link with -lm.

DESCRIPTION
       These  functions extract the exponent of x and return it as a floating-
       point value.  If FLT_RADIX is two, logb(x) is equal to  floor(log2(x)),
       except it's probably faster.

       If  x  is de-normalized, logb() returns the exponent x would have if it
       were normalized.

       If x is zero, -HUGE_VAL (resp. -HUGE_VALF, -HUGE_VALL) is returned, and
       a  pole error occurs.  If x is infinite, plus infinity is returned.  If
       x is NaN, NaN is returned.

ERRORS
       In order to check for errors, set errno to  zero	 and  call  feclearex‐
       cept(FE_ALL_EXCEPT) before calling these functions. On return, if errno
       is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO |	FE_OVERFLOW  |
       FE_UNDERFLOW) is non-zero, an error has occurred.

       If  an  error  occurs  and (math_errhandling & MATH_ERRNO) is non-zero,
       then errno is set to ERANGE.  If an error occurs and  (math_errhandling
       &  MATH_ERREXCEPT)  is non-zero, then the divide-by-zero floating-point
       exception is raised.

       A pole error occurs when x is zero.

HISTORY
       The logb() function occurs in 4.3BSD.

CONFORMING TO
       C99

SEE ALSO
       log(3), ilogb(3)

				  2004-10-31			       LOGB(3)
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