log2l3
Base-2 logarithmic function
Part of log2(3).
Usage
#include <math.h>
double log2(double x); float log2f(float x); long double log2l(long double x);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
log2(), log2f(), log2l():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
Library
Math library (libm, -lm)
Overview
These functions return the base-2 logarithm of x.
Return value
On success, these functions return the base-2 logarithm of x.
For special cases, including where x is 0, 1, negative, infinity, or NaN, see log(3).
Errors
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
For a discussion of the errors that can occur for these functions, see log(3).
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| log2(), log2f(), log2l() | Thread safety | MT-Safe |
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.