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ilogb(3M)		Mathematical Library Functions		     ilogb(3M)

NAME
       ilogb, ilogbf, ilogbl - return an unbiased exponent

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       int ilogb(double x);

       int ilogbf(float x);

       int ilogbl(long double x);

       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       int ilogb(double x);

       int ilogbf(float x);

       int ilogbl(long double x);

DESCRIPTION
       These  functions	 return	 the  exponent part of their argument x.  For‐
       mally, the return value is the integral part  of	  log(r)|  x  |	 as  a
       signed  integral	 value,	 for  non-zero	x, where r is the radix of the
       machine's floating point arithmetic, which is the  value	 of  FLT_RADIX
       defined in <float.h>.

RETURN VALUES
       Upon successful completion, these functions return the exponent part of
       x as a signed integer value. They are equivalent to calling the	corre‐
       sponding logb(3M) function and casting the returned value to type int.

       If x is 0, the value FP_ILOGB0 is returned. For SUSv3-conforming appli‐
       cations compiled with the c99 compiler  driver  (see  standards(5)),  a
       domain error occurs.

       If  x  is  ±Inf,	 the  value  INT_MAX is returned. For SUSv3-conforming
       applications compiled with the c99  compiler  driver,  a	 domain	 error
       occurs.

       If  x  is  NaN, the value FP_ILOGBNAN is returned. For SUSv3-conforming
       applications compiled with the c99  compiler  driver,  a	 domain	 error
       occurs.

ERRORS
       These functions will fail if:

       Domain Error    The x argument is zero, NaN, or ±Inf.

		       If   the	  integer   expression	 (math_errhandling   &
		       MATH_ERREXCEPT) is non-zero, then the invalid floating-
		       point exception is raised.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       feclearexcept(3M),    fetestexcept(3M),	  limits.h(3HEAD),   logb(3M),
       math.h(3HEAD), scalb(3M), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			     ilogb(3M)
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