# 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**():

_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).

## 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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