Originální popis anglicky:
log, logf, logl - natural logarithmic function
Návod, kniha: Linux Programmer's Manual
#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).
SVID 3, POSIX, BSD 4.3, ISO 9899. The float and the long double variants are C99
requirements.
cbrt(3),
sqrt(3)
