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   log

   Usage
   #include <math.h>
   double log(double x);

   Description
   log returns the natural logarithm of x. The value of x must be > 0.

   Example
   #include <math.h>
   #include <stdio.h>

   main(int argc,char **argv)
   {
   double d,result;
        d = atof(argv[1]);
        result = log(d);
        printf("The log of %.2f is %f\n",d,result);
   }

   Return Value
   The  log function returns the logarithm result or domain error if x  <
   0, range error if x == 0.