ILOGB(3) BSD Library Functions Manual ILOGB(3)
NAME
ilogb -- return exponent as an integer value
SYNOPSIS
#include <math.h>
int
ilogb(double x);
int
ilogbl(long double x);
int
ilogbf(float x);
DESCRIPTION
The ilogb() functions return the exponent of x as a signed integer value.
SPECIAL VALUES
ilogb(+-0) returns FP_ILOGB0.
ilogb(+-infinity) returns INT_MAX.
ilogb(x) returns FP_ILOGBNAN if x is a NaN.
A range error may occur if x is 0, +-infinity, or a nan.
The special return values FP_ILOGB0 and FP_ILOGBNAN are defined in math.h, and may differ between platforms. INT_MAX is defined in limits.h.
SEE ALSO
math(3)
STANDARDS
The ilogb() functions conform to ISO/IEC 9899:2011.
BSD
December 11, 2006 BSD
