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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).

     allbox;  lbw28  lb  lb  l  l  l.  Interface Attribute Value T{ log10(),
     log10f(), log10l() T}   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

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     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

                                2017-09-15                          LOG10(3)