log - phpMan

EXP(3)                     Linux Programmer's Manual                    EXP(3)



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)



                                  2002-07-27                            EXP(3)

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