ilogb man page on ElementaryOS

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

NAME
       ilogb, ilogbf, ilogbl - get integer exponent of a floating-point value

SYNOPSIS
       #include <math.h>

       int ilogb(double x);
       int ilogbf(float x);
       int ilogbl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       ilogb():
	   _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
	   _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
	   _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99
       ilogbf(), ilogbl():
	   _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION
       These functions return the exponent part of their argument as a	signed
       integer.	  When	no error occurs, these functions are equivalent to the
       corresponding logb(3) functions, cast to int.

RETURN VALUE
       On success, these functions return the exponent of x, as a signed inte‐
       ger.

       If  x  is  zero,	 then  a domain error occurs, and the functions return
       FP_ILOGB0.

       If x is a NaN, then a domain error occurs,  and	the  functions	return
       FP_ILOGBNAN.

       If  x  is  negative  infinity or positive infinity, then a domain error
       occurs, and the functions return INT_MAX.

ERRORS
       See math_error(7) for information on how to determine whether an	 error
       has occurred when calling these functions.

       The following errors can occur:

       Domain error: x is 0 or a NaN
	      An invalid floating-point exception (FE_INVALID) is raised.

	      These functions do not set errno for this case.

       Domain error: x is an infinity

	      These  functions do not set errno or raise an exception for this
	      case.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The ilogb(), ilogbf(), and ilogbl() functions are thread-safe.

CONFORMING TO
       C99, POSIX.1-2001.

SEE ALSO
       log(3), logb(3), significand(3)

COLOPHON
       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

				  2013-08-06			      ILOGB(3)
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