ilogb man page on DigitalUNIX

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ilogb(3)							      ilogb(3)

       ilogb - Returns an unbiased exponent

       #include <math.h>

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

       Math Library (libm)

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       ilogb():	 XPG4-UNIX

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

       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 arith‐

       The following table describes function behavior in response  to	excep‐
       tional arguments:

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


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