log2

Sommaire

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)