ilogbl.c File Reference

#include "../math.h"

Functions
int	ilogbl (long double x)
	Integer binary logarithm. More...

Function Documentation

ilogbl()

int ilogbl

(

long double

x

)

Integer binary logarithm.

The ilogbl functions extract the exponent of x as a signed int value. If x is zero they compute the value FP_ILOGB0; if x is infinite they compute the value INT_MAX; if x is a NaN they compute the value FP_ILOGBNAN; otherwise, they are equivalent to calling the corresponding logb function and casting the returned value to type int. A domain error or range error may occur if x is zero, infinite, or NaN. If the correct value is outside the range of the return type, the numeric result is unspecified.

Parameters

x	Value whose ilogbl is returned.

Returns

The ilogbl functions return the exponent of x as a signed int value.