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    The following form allows you to view linux man pages.

    Command:

    logl

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double log(double x);
           float logf(float x);
           long double logl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           logf(), logl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

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

    RETURN VALUE

           On success, these functions return the natural logarithm of x.
    
           If x is a NaN, a NaN is returned.
    
           If x is 1, the result is +0.
    
           If x is positive infinity, positive infinity is returned.
    
           If x is zero, then a  pole  error  occurs,  and  the  functions  return
           -HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively.
    
           If  x  is  negative  (including negative infinity), then a domain error
           occurs, and a NaN (not a number) is returned.
    
    
    

    ERRORS

           See math_error(7) for information on how to determine whether an  error
           has occurred when calling these functions.
    
           The following errors can occur:
    
           Domain error: x is negative
                  errno  is  set  to  EDOM.   An  invalid floating-point exception
                  (FE_INVALID) is raised.
    
           Pole error: x is zero
                  errno is set to ERANGE.  A divide-by-zero floating-point  excep-
                  tion (FE_DIVBYZERO) is raised.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
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