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Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
Index Return to Main Contents
 

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);

Link with -lm.  

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

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

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
ERRORS
CONFORMING TO
SEE ALSO

linux.jgfs.net manual pages