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 - INT_MAX.

ilogb(±infinity) returns INT_MAX.

ilogb(x) returns INT_MAX if x is a NaN.

A range error may occur if x is 0.

SEE ALSO
math(3)

STANDARDS
The ilogb() functions conform to ISO/IEC 9899:1999(E).