# LOG10

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

SEE ALSO

COLOPHON

## 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**():

_BSD_SOURCE || _SVID_SOURCE ||
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;

or *cc -std=c99*

## DESCRIPTION

The
**log10**() function returns 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).

## CONFORMING TO

C99,
POSIX.1-2001. 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 3.53 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/.