.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)

.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk

.\"     <mtk.manpages@gmail.com>

.\"

.\" %%%LICENSE_START(VERBATIM)

.\" Permission is granted to make and distribute verbatim copies of this

.\" manual provided the copyright notice and this permission notice are

.\" preserved on all copies.

.\"

.\" Permission is granted to copy and distribute modified versions of this

.\" manual under the conditions for verbatim copying, provided that the

.\" entire resulting derived work is distributed under the terms of a

.\" permission notice identical to this one.

.\"

.\" Since the Linux kernel and libraries are constantly changing, this

.\" manual page may be incorrect or out-of-date.  The author(s) assume no

.\" responsibility for errors or omissions, or for damages resulting from

.\" the use of the information contained herein.  The author(s) may not

.\" have taken the same level of care in the production of this manual,

.\" which is licensed free of charge, as they might when working

.\" professionally.

.\"

.\" Formatted or processed versions of this manual, if unaccompanied by

.\" the source, must acknowledge the copyright and authors of this work.

.\" %%%LICENSE_END

.\"

.\" References consulted:

.\"     Linux libc source code

.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)

.\"     386BSD man pages

.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)

.\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>

.\" Modified 2002-07-27 by Walter Harms

.\" 	(walter.harms@informatik.uni-oldenburg.de)

.\"

.TH LOG10 3  2017-09-15  "" "Linux Programmer's Manual"

.SH NAME

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

.SH SYNOPSIS

.nf

.B #include <math.h>

.PP

.BI "double log10(double " x );

.BI "float log10f(float " x );

.BI "long double log10l(long double " x );

.fi

.PP

Link with \fI\-lm\fP.

.PP

.in -4n

Feature Test Macro Requirements for glibc (see

.BR feature_test_macros (7)):

.in

.PP

.ad l

.BR log10f (),

.BR log10l ():

.RS 4

_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L

    || /* Since glibc 2.19: */ _DEFAULT_SOURCE

    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

.RE

.ad

.SH DESCRIPTION

These functions return the base 10 logarithm of

.IR x .

.SH RETURN VALUE

On success, these functions return the base 10 logarithm of

.IR x .

.PP

For special cases, including where

.I x

is 0, 1, negative, infinity, or NaN, see

.BR log (3).

.SH ERRORS

See

.BR math_error (7)

for information on how to determine whether an error has occurred

when calling these functions.

.PP

For a discussion of the errors that can occur for these functions, see

.BR log (3).

.SH ATTRIBUTES

For an explanation of the terms used in this section, see

.BR attributes (7).

.TS

allbox;

lbw28 lb lb

l l l.

Interface	Attribute	Value

T{

.BR log10 (),

.BR log10f (),

.BR log10l ()

T}	Thread safety	MT-Safe

.TE

.SH CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

.PP

The variant returning

.I double

also conforms to

SVr4, 4.3BSD, C89.

.SH SEE ALSO

.BR cbrt (3),

.BR clog10 (3),

.BR exp10 (3),

.BR log (3),

.BR log2 (3),

.BR sqrt (3)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I 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/.