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

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

SEE ALSO

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