logbf.c File Reference

#include "../math.h"

Functions
float	logbf (float x)
	Compute logarithm using FLT_RADIX. More...

Function Documentation

logbf()

float logbf

(

float

x

)

Compute logarithm using FLT_RADIX.

The logbf functions extract the exponent of x, as a signed integer value in floating-point format. If x is subnormal it is treated as though it were normalized; thus, for positive finite x, 1 ≤ x × FLT_RADIX^(−log_b(x)) < FLT_RADIX. A domain error or pole error may occur if the argument is zero.

Parameters

x	Value whose logarithm is calculated.

Returns

The logbf functions return the signed exponent of x.