NAME
ilogb, ilogbf,
ilogbl —
extract exponent
SYNOPSIS
#include
<math.h>
int
ilogb(double
x);
int
ilogbf(float
x);
int
ilogbl(long
double x);
DESCRIPTION
ilogb()
returns x's exponent n, in
integer format.
ilogb(±infinity)
returns INT_MAX,
ilogb(NaN) returns
FP_ILOGBNAN and
ilogb(0) returns
FP_ILOGB0. The
ilogbf()
function is a single precision version of ilogb().
The
ilogbl()
function is an extended precision version of
ilogb().
SEE ALSO
STANDARDS
IEEE Std 754-1985
HISTORY
The ilogb, ilogbf
and ilogbl functions appeared in
4.3BSD, NetBSD 1.1 and
OpenBSD 4.5, respectively.