log2l(3) -- Linux man page

 

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);
 

DESCRIPTION

The log2() function returns the natural logarithm of x.  

ERRORS

The log2() function can return the following error:
EDOM
The argument x is negative.
 

CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899. The float and the long double variants are C99 requirements.  

SEE ALSO

sqrt(3), cbrt(3)