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printf "%3.5g %3.5g %3.5g %3.5g\n",
  ($e+0), (0+$e), (0-$e),($e-0);
...

printf "%3.5g %3.5g %3.5g %3.5g\n",
  ($e**2), ($e**0), (0/$e),($e/0);

  0   0   0   0
  1   1   1  -1
  2   0   1   1
  0   1   0   0