log10 (3)
Leading comments
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 ...
NAME
log10, log10f, log10l  base10 logarithmic functionSYNOPSIS
#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
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).Interface  Attribute  Value 
log10(), log10f(), log10l()  Thread safety  MTSafe 
CONFORMING TO
C99, POSIX.12001, POSIX.12008.The variant returning double also conforms to SVr4, 4.3BSD, C89.