log2 - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMElog2, log2f, log2l − base-2 logarithmic function

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#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

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DESCRIPTIONThese functions return the base 2 logarithm of x.

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RETURN VALUEOn 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).

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ERRORSSee 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).

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue log2(), log2f(), log2l() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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SEE ALSOcbrt(3), clog2(3), log(3), log10(3), sqrt(3) 0

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