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

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

       #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 ||
       _ISOC99_SOURCE; or cc -std=c99
       ilogbf(), ilogbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
       || _ISOC99_SOURCE; or cc -std=c99

       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.

       On success, these functions return the exponent of x, as a signed inte‐

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

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

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

       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

       C99, POSIX.1-2001.

       log(3), logb(3), significand(3)

       This  page  is  part of release 3.22 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

				  2009-02-04			      ILOGB(3)

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