ilogb(3) Library Functions Manual ilogb(3)
NAME
ilogb - Returns an unbiased exponent
LIBRARY
Math Library (libm.a)
SYNOPSIS
#include <math.h>
int ilogb (double x); int ilogbf (float x); int ilogbl (long double x);
STANDARDS
Interfaces documented on this reference page conform to industry standards 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 arithmetic.
The following table describes function behavior in response to exceptional arguments:
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Function Exceptional Argument Routine Behavior
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ilogb(), ilogbf() ilogbl() |x| = infinity INT_MAX
ilogb(), ilogbf() ilogbl() x = 0, NaN INT_MIN
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ilogb(3)
