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  1. or download this
    >>> .3 - .2 - .1
-2.7755575615628914e-17
  2. or download this
    $  perl -E 'say  .3 - .2 - .1;'
-2.77555756156289e-17
  3. or download this
    > say .3 - .2 - .1;
0
> printf "%.50f\n", .3 - .2 - .1;
0.00000000000000000000000000000000000000000000000000