LOG10(3)                   Linux Programmer's Manual                  LOG10(3)



NAME
       log10, log10f, log10l -  base-10 logarithmic function

SYNOPSIS
       #include <math.h>

       double log10(double x);
       float log10f(float x);
       long double log10l(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       log10f(), log10l():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       These functions return the base 10 logarithm of x.

RETURN VALUE
       On success, these functions return the base 10 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   |
       +----------------------------+---------------+---------+
       |log10(), log10f(), log10l() | Thread safety | MT-Safe |
       +----------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.

       The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO
       cbrt(3), clog10(3), exp10(3), log(3), log2(3), sqrt(3)

COLOPHON
       This  page  is  part of release 4.16 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.



                                  2017-09-15                          LOG10(3)