Return the logarithm of their arguments.

    Format

      #include  <math.h>

      double log  (double x);

      float logf  (float x); (Integrity servers, Alpha)

      long double logl  (long double x); (Integrity servers, Alpha)

      double log2  (double x); (Integrity servers, Alpha)

      float log2f  (float x); (Integrity servers, Alpha)

      long double log2l  (long double x); (Integrity servers, Alpha)

      double log10  (double x);

      float log10f  (float x); (Integrity servers, Alpha)

      long double log10l  (long double x);
                          (Integrity servers, Alpha)