Table of Contents
log, logf, logl - natural logarithmic
function
#include <math.h>
double log(double x);
float logf(float x);
long double logl(long double x);
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).
SVID 3, POSIX,
BSD 4.3, ISO 9899. The float and the long double variants are C99 requirements.
sqrt(3)
, cbrt(3)
Table of Contents