ILOGB(3) OpenBSD Programmer's Manual ILOGB(3)NAME
ilogb, ilogbf, ilogbl - extract exponent
SYNOPSIS
#include <math.h>
int
ilogb(double x);
int
ilogbf(float x);
int
ilogbl(long double x);
DESCRIPTIONilogb() returns x's exponent n, in integer format. ilogb(+-infinity)
returns INT_MAX and ilogb(0) returns INT_MIN. The ilogbf() function is a
single precision version of ilogb(). The ilogbl() function is an
extended precision version of ilogb().
SEE ALSOmath(3)STANDARDS
IEEE Std 754-1985
HISTORY
The ilogb, ilogbf and ilogbl functions appeared in 4.3BSD, NetBSD 1.1 and
OpenBSD 4.5, respectively.
OpenBSD 4.9 August 3, 2009 OpenBSD 4.9