linux man page for log10

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

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).

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 3.27 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)