osf1 man page for ilogb

ilogb(3)						     Library Functions Manual							  ilogb(3)

NAME
       ilogb - Returns an unbiased exponent

LIBRARY
       Math Library (libm.a)

SYNOPSIS
       #include <math.h>

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

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       ilogb():  XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

DESCRIPTION
       The  ilogb(),  ilogbf(),  and  ilogbl() functions return the integral part of the base r  logarithm of (|x|) as a signed integral value for
       non-zero x, where r is the radix of the machine's floating point arithmetic.

       The following table describes function behavior in response to exceptional arguments:

       ---------------------------------------------------------------------
       Function 		    Exceptional Argument   Routine Behavior
       ---------------------------------------------------------------------
       ilogb(), ilogbf() ilogbl()   |x| = infinity	   INT_MAX
       ilogb(), ilogbf() ilogbl()   x = 0, NaN		   INT_MIN
       ---------------------------------------------------------------------
       delim off

																	  ilogb(3)