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/*

 * compute 10**x by successive squaring.

 */

#include <_ansi.h>

#include "std.h"

double

_DEFUN (__exp10, (x),

        unsigned x)

{

  static _CONST double powtab[] =

  {1.0,

   10.0,

   100.0,

   1000.0,

   10000.0};

  if (x < (sizeof (powtab) / sizeof (double)))

      return powtab[x];

  else if (x & 1)

    {

      return 10.0 * __exp10 (x - 1);

    }

  else

    {

      double n = __exp10 (x / 2);

      return n * n;

    }

}