ilogb(3)ilogb(3)NAMEilogb - Returns an unbiased exponent
SYNOPSIS
#include <math.h>
int ilogb(
double x ); int ilogbf(
float x ); int ilogbl(
long double x );
LIBRARY
Math Library (libm)
STANDARDS
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.
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 arith‐
metic.
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
───────────────────────────────────────────────────────────────────────
ilogb(3)
