CentOS 5.3

GNU/Linux	CentOS 5.3
	log(3)

EXP

NAME

log, logf, logl − natural logarithmic function

#include <math.h>

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

Link with −lm.

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

The log() function can return the following errors:

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

SVr4, 4.3BSD, C89. The float and long double variants are C99 requirements.