logl(3) -- Linux man page

 

NAME

log, logf, logl - natural logarithmic function  

SYNOPSIS

#include <math.h>

double log(double x);

float logf(float x);

long double logl(long double x);
 

DESCRIPTION

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

ERRORS

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).
 

CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899. The float and the long double variants are C99 requirements.  

SEE ALSO

sqrt(3), cbrt(3)