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    Command:

    log2f

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double log2(double x);
           float log2f(float x);
           long double log2l(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           log2(), log2f(), log2l():
               _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The log2() function returns 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).
    
    
    

    VERSIONS

           These functions first appeared in glibc in version 2.1.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD.
    
    
    

    SEE ALSO

           cbrt(3), clog2(3), log(3), log10(3), sqrt(3)
    
                                      2010-09-12                           LOG2(3)
    
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