LOG(3)			   Linux Programmers Manual		       LOG(3)



NAME
       log, logf, logl - natural logarithmic function

SYNOPSIS
       #include 

       double log(double x);
       float logf(float x);
       long double logl(long double x);

       Link with -lm.

DESCRIPTION
       The log() function returns the natural logarithm of x.

ERRORS
       EDOM   The argument x is negative.

       ERANGE The  argument  x is zero.  The log of zero is not defined (minus
	      infinity).

CONFORMING TO
       SVr4, 4.3BSD, C89.  The float and long double variants are C99 require
       ments.

SEE ALSO
       cbrt(3), clog(3), log1p(3), sqrt(3)

COLOPHON
       This  page  is  part of release 3.05 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/.



				  2008-07-15				LOG(3)