NAME

ilogb − returns an unbiased exponent

SYNOPSIS

cc [ flag ... ] file ... −lm [ library ... ]

#include <math.h>

int ilogb(double x);

DESCRIPTION

The ilogb() function returns the exponent part of x.  Formally, the return value is the integral part of logr|x| as a signed integral value, for non-zero finite x, where r is the radix of the machine’s floating point arithmetic. 

RETURN VALUES

Upon successful completion, ilogb() returns the exponent part of x. 

If x is 0, ilogb() returns −INT_MAX. 

If x is NaN or ±Inf, ilogb() returns INT_MAX. 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

SEE ALSO

logb(3M), attributes(5)

SunOS 5.6  —  Last change: 29 Dec 1996