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   exp

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

   Description
   exp generates the natural exponent of the argument x.

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

   main()
   {
   double dnum, xpnt;
        dnum = 3.1415926;
        xpnt = exp(dnum);
        printf("The exp(%f) = %f\n",dnum,xpnt);
   }

   Return Value
   Returns  the real exponential function e to the x. If overflow,  errno
   is set to ERANGE and HUGE_VAL is returned. If underflow, exp returns 0
   and does not set errno. The function matherr can be used to modify the
   behavior on error.