LOG2

Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
Index Return to Main Contents
 

NAME

log2, log2f, log2l - base-2 logarithmic function  

SYNOPSIS

#include <math.h>

double log2(double x);

float log2f(float x);
long double log2l(long double x);

Compile with -std=c99; link with -lm.  

DESCRIPTION

The log2() function returns the base 2 logarithm of x.  

ERRORS

The log2() function can return the following error:
EDOM
The argument x is negative.
ERANGE
The argument x is zero. The log of zero is not defined (minus infinity).
 

CONFORMING TO

SVr4, 4.3BSD, C89. The float and long double variants are C99 requirements.  

SEE ALSO

cbrt(3), clog2(3), sqrt(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
ERRORS
CONFORMING TO
SEE ALSO

linux.jgfs.net manual pages