NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

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

NAME         top

       log10, log10f, log10l -  base-10 logarithmic function

SYNOPSIS         top

       #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():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
           _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

DESCRIPTION         top

       The log10() function returns the base 10 logarithm of x.

RETURN VALUE         top

       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         top

       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).

CONFORMING TO         top

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.32 of the Linux man-pages project.  A
       description of the project, and information about reporting bugs, can be found
       at http://www.kernel.org/doc/man-pages/.

                                      2010-09-20                             LOG10(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface